AMESBURY — NB Bancorp, Inc., the holding company for Needham Bank, and Provident Bancorp, Inc., the holding company for BankProv, on Friday jointly announced that the two banks officially merged.

The declaration comes roughly six months after Needham Bank officials announced they had reached a deal to purchase BankProv in a stock and cash transaction. Promptly following the merger, BankProv was absorbed into Needham Bank.

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