Derivative Financial Instruments (Summary Amounts Included in Consolidated Statement of Income Related to Derivatives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Interest rate swaps and caps | Trading gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated in hedge relationships	$ (75)	$ (848)
Mortgage banking derivatives | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated in hedge relationships	(792)	1,314
Covered call options | Fees from covered call options
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated in hedge relationships	3,519	4,402
Foreign exchange contracts | Trading gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated in hedge relationships	$ 20	$ (38)