Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Trading Assets [Member] | Interest Rate-related instruments - customer and mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	$ 1,829,842	$ 1,665,965
Fair Value	56,334	29,391
Trading Assets [Member] | Foreign currency exchange forwards [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	99,074	72,976
Fair Value	3,159	1,532
Trading Assets [Member] | Commodity contract [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	109,971	44,380
Fair Value	17,619	1,269
Trading Liabilities [Member] | Interest Rate-related instruments - customer and mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,829,842	1,665,965
Fair Value	(59,255)	(30,886)
Trading Liabilities [Member] | Foreign currency exchange forwards [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	92,457	65,649
Fair Value	(3,073)	(1,398)
Trading Liabilities [Member] | Commodity contract [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	110,457	44,256
Fair Value	(17,138)	(1,146)
Other Assets [Member] | Interest rate lock commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	530,571	271,530
Fair Value	4,270	958
Other Assets [Member] | Forward commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount		231,798
Fair Value		403
Other Assets [Member] | Purchased options (time deposit) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	101,421	104,582
Fair Value	2,336	2,715
Other Liabilities [Member] | Forward commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	353,185
Fair Value	(4,205)
Other Liabilities [Member] | Written options (time deposit) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	101,421	104,582
Fair Value	$ (2,336)	$ (2,715)