Guarantees (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Guarantor Obligations [Line Items]
Derivative Liabilities	$ 35,006	$ 12,729
Notional amount of underlying interest rate swaps associated with risk participation agreements	1,467,355	$ 1,184,666
Financial Standby Letter Of Credit [Member]
Guarantor Obligations [Line Items]
Standby letters of credit, net liability	2,600
Contractual amount of letters of credit, guaranteed maximum potential future payments	359,000
Risk Participation Agreement [Member] | Indirect Guarantee Of Indebtedness [Member]
Guarantor Obligations [Line Items]
Derivative Liabilities	289
Notional amount of underlying interest rate swaps associated with risk participation agreements	$ 58,000
Minimum [Member] | Risk Participation Agreement [Member]
Guarantor Obligations [Line Items]
Term, in years	3 years
Maximum [Member] | Risk Participation Agreement [Member]
Guarantor Obligations [Line Items]
Term, in years	11 years