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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income $ 890 $ 336 $ 1,013 $ 683
Derivatives Not Designated as Hedging Instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income 890 336 1,013 683
Interest Rate Swap [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Income (Loss) from Derivative Instruments, Net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income 854 349 838 419
Credit Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Income (Loss) from Derivative Instruments, Net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income 48 5 54 187
Mortgage Banking [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Income (Loss) from Derivative Instruments, Net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income $ (12) $ (18) $ 121 $ 77