Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Entity Information
Credit Extension Commitments	$ 1,401,686	$ 1,415,119
Credit Extension Commitments, Beyond One Year	388,752	363,609
Standby Letters of Credit
Entity Information
Credit Extension Commitments	52,250	58,950
Unused Credit Card Lines
Entity Information
Credit Extension Commitments	$ 581,695	$ 476,752