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Derivative Instruments and Hedging Activities (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) Agreement	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Agreement	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) Agreement
Interest rate derivatives - Included Component [Abstract]
Amount of gain (loss) recognized in other comprehensive income	$ 0	$ 9	$ (274)	$ (475)
Amount of loss (gain) reclassified from AOCI into interest expense	101	(395)	192	(1,932)
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	0		0		$ 4
Fair value adjustment included in other liabilities	136		136		45
Notional amount	25,000		25,000		$ 50,000
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member]
Interest rate derivatives - Included Component [Abstract]
Amount of gain (loss) recognized in other comprehensive income	0	9	(274)	(475)
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest (Income) Expense [Member]
Interest rate derivatives - Included Component [Abstract]
Amount of loss (gain) reclassified from AOCI into interest expense	101	(395)	192	(1,932)
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			124
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	$ (20)	$ (10)	$ 127	$ 96
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Interest rate derivatives [Abstract]
Number of risk participation agreements held | Agreement	16		16		15
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	$ 122,546		$ 122,546		$ 41,650
Notional amount	2,265,651		2,265,651		963,209
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member]
Interest rate derivatives [Abstract]
Fair value of derivative asset	350		350		112
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Interest rate derivatives [Abstract]
Fair value of derivative liability	152		152		82
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	$ 109,311		$ 109,311		$ 97,614

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