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Cash and Due from Banks	9 Months Ended
Cash and Due from Banks	Sep. 30, 2018
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 Board of Governors of the Federal Reserve System (“FRB”). Some or all of these reserve requirements may be satisfied with vault cash. Reserve balances amounted to $20.7 million at September 30, 2018 and $14.1 million at December 31, 2017 and were included in cash and due from banks in the Unaudited Consolidated Balance Sheets. As of September 30, 2018 and December 31, 2017, cash and due from banks included interest-bearing deposits in other banks of $20.8 million and $31.9 million, respectively.