Financial Instruments with Off-Balance Sheet Risk (Details) $ in Thousands	Sep. 30, 2016 USD ($)
Entity Information [Line Items]
Credit Extension Commitments	$ 1,604,619
Credit Extension Commitments, Beyond One Year	419,638
Standby Letters of Credit
Entity Information [Line Items]
Credit Extension Commitments	54,424
Unused Credit Card Lines
Entity Information [Line Items]
Credit Extension Commitments	$ 545,399