Derivative Financial Instruments (Summary Amounts Included in Consolidated Statement of Income Related to Derivatives) (Details) - Not designed as hedging instrument - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
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	$ (380)	$ (75)
Mortgage banking derivatives | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated in hedge relationships	100	(792)
Covered call options | Fees from covered call options
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated in hedge relationships	3,670	3,519
Foreign exchange contracts | Trading gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated in hedge relationships	43	20
Derivative contract held as economic hedge on MSRs | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated in hedge relationships	$ 519	$ 0