Contract analysis

I. DOCUMENTS REVIEWED In rendering the opinions set forth herein, we have examined executed originals or copies, certified or otherwise identified to our satisfaction, of the following documents (collectively, items (1) through (4) below, the "Transaction Documents"):

1. The Indenture, dated as of February 24, 2026 (the "Indenture"), between BRB, as Issuer, and Brindoval Trust Company, National Association, as Trustee, pursuant to which the Notes are being issued;

2. The Form of Rule 144A Global Note in the aggregate principal amount of $350,000,000, representing the 6.750% Fixed-to-Floating Rate Subordinated Notes due 2036 (CUSIP 082651 AB7), in the form attached as an exhibit to the Indenture (the "Global Note");

3. The Purchase Agreement, dated as of February 19, 2026 (the "Purchase Agreement"), among BRB, Wainwright Zanthor & Co., LLC, as representative of the several initial purchasers named therein (the "Representative"), Redstone Capital Markets LLC, and Kensington Hale Securities Inc. (collectively, the "Initial Purchasers");

4. The Registration Rights Agreement, dated as of February 24, 2026 (the "Registration Rights Agreement"), among BRB and the Initial Purchasers; In addition to the Transaction Documents, we have also examined the following:

5. The Articles of Association (Charter) of Brindoval Trust Company, National Association, as currently in effect (the "Charter");

6. The Bylaws of Brindoval Trust Company, National Association, as amended through the date hereof and currently in effect (the "Bylaws");

7. Resolutions duly adopted by the Board of Directors (or an authorized committee thereof) of Brindoval Trust Company, National Association, authorizing the acceptance of the trusteeship under the Indenture and the execution and delivery of the Indenture and related documents in connection with the issuance of the Notes (the "Resolutions");

8. A certificate of corporate existence and good standing for Brindoval Trust Company, National Association, issued by the Office of the Comptroller of the Currency (the "OCC") dated as of a recent date (the "Good Standing Certificate");

9. An incumbency certificate, dated as of the Closing Date, of the officers of Brindoval Trust Company, National Association, authorized to execute and deliver the Indenture and related documents on behalf of the Trustee (the "Incumbency Certificate"); and

10. Such other documents, corporate records, certificates of officers and representatives of the Trustee, and certificates of public officials, as we have deemed necessary or appropriate as a basis for the opinions expressed herein. We have also made such inquiries of designated officers of the Trustee and conducted such review of the Trustee's files as we have deemed relevant and necessary for purposes of this opini

II. ASSUMPTIONS In rendering the opinions set forth herein, we have assumed, without independent verification, the following: (a) The genuineness of all signatures on all documents examined by us, other than the signatures of officers and authorized representatives of Brindoval Trust Company, National Association. (b) The authenticity and completeness of all documents submitted to us as originals and the conformity t

III. OPINIONS Based upon and subject to the foregoing, and subject to the qualifications and limitations set forth in Section IV below, we are of the opinion that: Opinion 1 — Due Organization and Good Standing Brindoval Trust Company, National Association is a national banking association duly organized, validly existing, and in good standing under the laws of the United States of America. The Trustee is a trust com

IV. QUALIFICATIONS AND LIMITATIONS The opinions set forth in Section III above are subject to the following qualifications, limitations, and exceptions:

1. Governing Law Limitation. The opinions expressed herein are limited to the federal laws of the United States of America (including the National Bank Act, 12 U.S.C. §§ 1 et seq., and the rules, regulations, and published interpretive guidance of the OCC) and the laws of the Commonwealth of Massachusetts, in each case as in effect on the date hereof. We express no opinion as to the laws of any other state or jurisdi

2. Additional Enforceability Qualifications. The enforceability opinion set forth in Opinion 5 is further subject to the effect of generally applicable laws that: (a) limit or affect the enforcement of provisions of a contract providing for the payment of penalties or liquidated damages upon or following a breach of any provision thereof; (b) provide for the avoidance of preferential or fraudulent transfers or convey

3. Specific Provision Qualifications. No opinion is expressed herein as to the enforceability of any particular provision of the Indenture relating to: (a) waivers of rights under any applicable law, statute, or regulation, to the extent that such rights may not be waived as a matter of law or public policy; (b) consents to jurisdiction, venue selection, or service of process provisions that may be rendered unenforce

4. As-of-Date Limitation. The opinions expressed herein are rendered as of the date hereof only and are based upon the facts and circumstances existing, and the laws, rules, and regulations in effect, as of the date hereof. We assume no obligation to advise any person of any change in applicable law, regulation, or interpretation thereof, or any change in fact or circumstance, occurring after the date hereof, even if

5. No Regulatory, Tax, or Securities Law Opinions. We express no opinion with respect to: (a) the characterization of the Notes for regulatory capital purposes under applicable bank capital rules and regulations, including the rules and regulations of the Board of Governors of the Federal Reserve System, the OCC, or the Federal Deposit Insurance Corporation; (b) any federal, state, or local tax consequences of the is

6. Knowledge Qualification. Where any opinion expressed herein is qualified by the phrase "to the knowledge of the undersigned" or "to the knowledge of Trustee's counsel" or words of similar import, such knowledge is limited to the actual knowledge of the attorneys at this firm who have devoted substantive attention to the representation of Brindoval Trust Company, National Association in connection with the transact

V. RELIANCE AND BENEFIT This opinion is rendered solely for the benefit of the addressees hereof in connection with the transactions described herein and the closing of the offering of the Notes under the Purchase Agreement. This opinion may not be relied upon by any other person or entity, or for any other purpose, without the prior written consent of the undersigned. Notwithstanding the foregoing, we hereby consent