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Federal Funds Purchased	12 Months Ended
Federal Funds Purchased	Dec. 31, 2015
Banking and Thrift [Abstract]
Federal Funds Purchased	Federal Funds Purchased At December 31, 2015 and 2014, the Company had no outstanding federal funds purchased balances. The Bank had available lines of credit with the FHLB totaling $5.4 billion at December 31, 2015 subject to certain collateral requirements. The Bank had available lines of credit with the Federal Reserve totaling $333.3 million subject to certain collateral requirements, namely the amount of certain pledged loans at December 31, 2015. The Bank had uncommitted federal funds line of credit agreements with additional financial institutions totaling $450.0 million at December 31, 2015. At December 31, 2015, the lines of credit had interest rates ranging from 0.2% to 0.9%. Availability of the lines is subject to federal funds balances available for loan and continued borrower eligibility and are reviewed and renewed periodically throughout the year. These lines are intended to support short-term liquidity needs, and the agreements may restrict consecutive day usage.