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Restrictions on Cash and Due from Bank Accounts	12 Months Ended
Restrictions on Cash and Due from Bank Accounts	Dec. 31, 2016
Cash and Cash Equivalents [Abstract]
Restrictions on Cash and Due from Bank Accounts	RESTRICTIONS ON CASH AND DUE FROM BANK ACCOUNTS The Board of Governors of the Federal Reserve System, or the Federal Reserve, imposes certain reserve requirements on all depository institutions. These reserves are maintained in the form of vault cash or as an interest-bearing balance with the Federal Reserve. The required reserves averaged $36.8 million for 2016, $44.1 million for 2015 and $41.8 million for 2014.