Derivative Instruments and Hedging Activities (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021 USD ($) Agreement	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Agreement	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) Agreement
Interest rate derivatives - Included Component [Abstract]
Amount of (loss) recognized in other comprehensive income		$ 0	$ 0	$ 0	$ (274)
Amount of loss reclassified from AOCI into interest expense		0	101	21	192
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member]
Interest rate derivatives - Included Component [Abstract]
Amount of (loss) recognized in other comprehensive income		0	0	0	(274)
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest (Income) Expense [Member]
Interest rate derivatives - Included Component [Abstract]
Amount of loss reclassified from AOCI into interest expense		0	101	21	192
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member]
Derivative Liability [Abstract]
Amount to be reclassified from AOCI as a reduction to interest expense during next twelve months				0
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Other Assets [Member]
Derivative Asset [Abstract]
Derivatives, notional amount						$ 0
Derivatives, fair value						0
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivative Liability [Abstract]
Derivatives, notional amount						25,000
Derivatives, fair value						34
Derivatives Not Designated as Hedging Instruments [Member]
Derivative Asset [Abstract]
Derivatives, fair value		71,481		71,481		108,779
Netting adjustments, fair value	[1]	0		0
Net derivatives in the balance sheet, fair value		71,481		71,481
Derivatives not offset on the balance sheet, fair value		4,869		4,869
Cash collateral, fair value	[2]	0		0		0
Net derivative amounts, fair value		66,612		66,612		108,779
Derivative Liability [Abstract]
Derivatives, fair value		71,314		71,314		108,612
Netting adjustments, fair value	[1]	3,684		3,684
Net derivatives in the balance sheet, fair value		67,630		67,630
Derivatives not offset on the balance sheet, fair value		4,869		4,869
Cash collateral, fair value	[2]	55,730		55,730		107,350
Net derivative amounts, fair value		7,031		7,031		$ 1,262
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		$ (307)	$ (20)	$ (382)	$ 127
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Interest rate derivatives [Abstract]
Number of risk participation agreements held | Agreement		18		18		17
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member]
Derivative Asset [Abstract]
Derivatives, notional amount		$ 1,346,853		$ 1,346,853		$ 1,223,584
Derivatives, fair value		71,246		71,246		108,487
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivative Liability [Abstract]
Derivatives, notional amount		1,346,853		1,346,853		1,223,584
Derivatives, fair value		71,246		71,246		108,487
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Assets [Member]
Derivative Asset [Abstract]
Derivatives, notional amount		91,348		91,348		72,528
Derivatives, fair value		235		235		292
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Liabilities [Member]
Derivative Liability [Abstract]
Derivatives, notional amount		37,852		37,852		39,785
Derivatives, fair value		$ 68		$ 68		$ 125

[1] Netting adjustments represents the amounts recorded to convert derivatives assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance on the settle to market rules for cleared derivatives. The CME legally characterizes the variation margin posted between counterparties as settlements of the outstanding derivative contracts instead of cash collateral. Company began to clear certain derivative transactions through the CME in 2021.

[2] Cash collateral represents the amount that cannot be used to offset our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The other collateral consists of securities and is exchanged under bilateral collateral and master netting agreements that allow us to offset the net derivative position with the related collateral. The application of the other collateral cannot reduce the net derivative position below zero. Therefore, excess other collateral, if any, is not reflected above.