Financial Instruments with Off-Balance Sheet Risk (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Entity Information [Line Items]
Credit Extension Commitments	$ 1,063,924
Credit Extension Commitments, Beyond One Year	280,119
Standby Letters of Credit
Entity Information [Line Items]
Credit Extension Commitments	67,071
Unused Credit Card Lines
Entity Information [Line Items]
Credit Extension Commitments	$ 296,301