Financial Instruments with Off-Balance Sheet Risk (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Entity Information [Line Items]
Credit Extension Commitments	$ 1,259,320
Credit Extension Commitments, Beyond One Year	306,519
Standby Letters of Credit
Entity Information [Line Items]
Credit Extension Commitments	59,909
Unused Credit Card Lines
Entity Information [Line Items]
Credit Extension Commitments	$ 413,564