Derivatives (Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments) (Details) - Derivative instruments not designated as hedging instruments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Total net income (loss)	$ 21,969	$ 15,189	$ 4,400
Interest rate swaps and options | Derivative fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Total net income (loss)	(1,772)	2,557	65
Foreign exchange contracts | Foreign exchange income
Derivative Instruments, Gain (Loss) [Line Items]
Total net income (loss)	22,076	12,632	4,235
Foreign exchange options | Foreign exchange income
Derivative Instruments, Gain (Loss) [Line Items]
Total net income (loss)	0	0	236
Credit risk participation agreements (“RPAs”) | Derivative fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Total net income (loss)	(7)	0	0
Warrants | Ancillary loan fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Total net income (loss)	1,672	0	0
Embedded derivative liabilities | Other operating expense
Derivative Instruments, Gain (Loss) [Line Items]
Total net income (loss)	$ 0	$ 0	$ (136)