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Cash and Due from Banks	3 Months Ended
Cash and Due from Banks	Mar. 31, 2021
Cash and Cash Equivalents [Abstract]
Cash and Due from Banks	Cash and Due from Banks The Bank maintains certain average reserve balances to meet the requirements of the Federal Reserve Bank of Boston (“FRB”). Some or all of these reserve requirements may be satisfied with vault cash. Effective March 26, 2020, the FRB reduced the reserve requirement ratios to zero percent to eliminate the need for depository institutions, such as the Bank, to maintain balances in accounts at the FRB to satisfy reserve requirements. As a result, there were no reserve balances included in cash and due from banks in the Unaudited Consolidated Balance Sheets at March 31, 2021 and December 31, 2020. Cash and due from banks included interest-bearing deposits in other banks of $99.3 million and $138.4 million, respectively, at March 31, 2021 and December 31, 2020. See Note 10 for additional disclosure regarding cash collateral pledged to derivative counterparties.