Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Not Designated as Hedging Instrument | Other Assets [Member] | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	$ 2,761,552	$ 2,707,204
Derivative, Fair Value, Net	77,264	52,796
Not Designated as Hedging Instrument | Other Assets [Member] | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	166,935	117,879
Derivative, Fair Value, Net	2,683	721
Not Designated as Hedging Instrument | Other Assets [Member] | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	258,928	331,727
Derivative, Fair Value, Net	22,498	35,426
Not Designated as Hedging Instrument | Other Assets [Member] | Interest rate lock commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	396,130	191,222
Derivative, Fair Value, Net	4,869	2,208
Not Designated as Hedging Instrument | Other Assets [Member] | Purchased options (time deposit)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	4,814	11,185
Derivative, Fair Value, Net	126	109
Not Designated as Hedging Instrument | Other liabilities | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	2,761,552	2,707,204
Derivative, Fair Value, Net	(15,013)	(52,653)
Not Designated as Hedging Instrument | Other liabilities | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	159,340	69,153
Derivative, Fair Value, Net	(2,425)	(675)
Not Designated as Hedging Instrument | Other liabilities | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	258,485	315,861
Derivative, Fair Value, Net	(22,076)	(34,340)
Not Designated as Hedging Instrument | Other liabilities | Forward commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	333,060	139,984
Derivative, Fair Value, Net	(1,903)	(2,072)
Not Designated as Hedging Instrument | Other liabilities | Written options (time deposit)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	4,814	11,185
Derivative, Fair Value, Net	(126)	(109)
Designated as Hedging Instrument | Other liabilities | interest rate product [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	500,000	500,000
Derivative, Fair Value, Net	$ 69	$ (40)