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Derivative Instruments and Hedging Activities (Effect of Derivative Instruments on the Income Statement) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income $ 1,931 $ 890 $ 4,617 $ 1,013
Derivatives Not Designated as Hedging Instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income 1,931 890 4,617 1,013
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 1,310 854 3,715 838
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 13 48 136 54
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 $ 608 $ (12) $ 766 $ 121