Financial Instruments with Off-Balance Sheet Risk (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Entity Information
Credit Extension Commitments	$ 1,238,269	$ 1,144,695
Credit Extension Commitments, Beyond One Year	304,789	253,130
Standby Letters of Credit
Entity Information
Credit Extension Commitments	53,508	66,702
Unused Credit Card Lines
Entity Information
Credit Extension Commitments	$ 401,021	$ 337,532