Financial Instruments with Off-Balance Sheet Risk (Details) $ in Thousands	Sep. 30, 2015 USD ($)
Entity Information [Line Items]
Credit Extension Commitments	$ 1,591,054
Credit Extension Commitments, Beyond One Year	374,148
Standby Letters of Credit
Entity Information [Line Items]
Credit Extension Commitments	59,721
Unused Credit Card Lines
Entity Information [Line Items]
Credit Extension Commitments	$ 545,636