Cash and due from banks
12 Months Ended
Dec. 31, 2014
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 ($16.8 million and $8.0 million at December 31, 2014 and 2013, 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.