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Derivative Instruments and Hedging Activities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Agreement
Dec. 31, 2018
USD ($)
Agreement
Dec. 31, 2017
USD ($)
Interest rate derivatives - Included Component [Abstract]      
Amount of (loss) or gain recognized in OCI $ (459) $ 1,218 $ 901
Amount of gain reclassified from AOCI into interest expense (2,012) (2,300) (292)
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]      
Fair value adjustment recorded related to notional amount of derivatives outstanding and notional amount of risk participation agreements [Abstract]      
Fair value adjustment included in other assets 4 2,428  
Fair value adjustment included in other liabilities 45 0  
Notional amount 50,000 225,000  
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member]      
Interest rate derivatives - Included Component [Abstract]      
Amount of (loss) or gain recognized in OCI (459) 1,218 901
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest (Income) Expense [Member]      
Interest rate derivatives - Included Component [Abstract]      
Amount of gain reclassified from AOCI into interest expense (2,012) (2,300) (292)
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member]      
Fair value adjustment recorded related to notional amount of derivatives outstanding and notional amount of risk participation agreements [Abstract]      
Amount to be reclassified from AOCI as a reduction to interest expense during next twelve months 39    
Derivatives Not Designated as Hedging Instruments [Member] | Other Income [Member]      
Gain or loss recognized in income on derivatives not designating as a hedging relationship [Abstract]      
Decrease (increase) in other income $ 295 $ (120) $ 101
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]      
Interest rate derivatives [Abstract]      
Number of risk participation agreements held | Agreement 15 9  
Fair value adjustment recorded related to notional amount of derivatives outstanding and notional amount of risk participation agreements [Abstract]      
Fair value adjustment included in other assets and other liabilities $ 41,650 $ 17,572  
Notional amount 963,209 653,369  
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member]      
Interest rate derivatives [Abstract]      
Fair value of derivative asset 112 36  
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]      
Interest rate derivatives [Abstract]      
Fair value of derivative liability 82 17  
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]      
Fair value adjustment recorded related to notional amount of derivatives outstanding and notional amount of risk participation agreements [Abstract]      
Notional amount $ 97,614 $ 70,785