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Derivative Instruments and Hedging Activities (Effect of Derivative Instruments on the Income Statement) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in income $ 1,875 $ 746
Derivatives Not Designated as Hedging Instruments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in income 1,875 746
Interest Rate Swap [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Income from Derivative Instruments, Net [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in income 1,772 724
Credit Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Income from Derivative Instruments, Net [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in income 48 (5)
Mortgage Banking [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Income from Derivative Instruments, Net [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in income $ 55 $ 27