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Cash and due from banks	12 Months Ended
Cash and due from banks	Dec. 31, 2016
Cash and Due from Banks [Abstract]
Cash and due from banks	Cash and due from banks By regulation, the Bank must meet reserve requirements as established by the FRB ($24.8 million and $21.9 million at December 31, 2016 and 2015, respectively). Accordingly, the Bank complies with such requirements by holding cash on hand and maintaining average reserve balances on deposit with the FRB in accordance with such regulations.