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, 2020	Dec. 31, 2019
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	$ (1,107)	$ (380)
Mortgage banking derivatives | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated in hedge relationships	50,183	100
Covered call options | Fees from covered call options
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated in hedge relationships	2,292	3,670
Foreign exchange contracts | Trading gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated in hedge relationships	(13)	43
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	$ 4,749	$ 519