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Derivative Instruments and Hedge Activities - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Derivative notional amount	$ 866,486,000		$ 866,486,000		$ 391,847,000
Interest recorded	349,000	$ 465,000	1,333,000	$ 2,838,000
Unrealized gain (loss) to be reclassified as an decrease to interest expense during the next twelve months	868,000		868,000
Fair value of derivatives net liability position	12,300,000		12,300,000
Collateral amount posted	9,700,000		9,700,000
Offsetting derivative positions	1,814,000		1,814,000
Interest Rate Swap
Derivative [Line Items]
Interest recorded	29,000	22,000	71,000	64,000
Other Interest Rate Derivatives
Derivative [Line Items]
Derivative notional amount	$ 458,698,000		$ 458,698,000
Weighted average pay rates	4.23%		4.23%
Derivative maturity date, start year			2022-01
Derivative maturity date, end year			2031-09
Derivative instruments transaction fees	$ 134,000	$ 41,000	$ 840,000	$ 700,000
Other Credit Derivatives
Derivative [Line Items]
Derivative notional amount	7,800,000		7,800,000		8,400,000
Cash Flow Hedging
Derivative [Line Items]
Derivative notional amount	$ 400,000,000		$ 400,000,000
Weighted average pay rates	0.98%		0.98%
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivative [Line Items]
Derivative notional amount	$ 400,000,000		$ 400,000,000		0
Remaining balance in other comprehensive income	253,000		253,000		$ 304,000
Designated as Hedging Instrument | Cash Flow Hedging | Fixed Interest Rate Swaps Effective in March 2022
Derivative [Line Items]
Derivative notional amount	100,000,000.0		100,000,000.0
Designated as Hedging Instrument | Cash Flow Hedging | Fixed Interest Rate Swaps Effective in September 2022
Derivative [Line Items]
Derivative notional amount	50,000,000.0		50,000,000.0
Designated as Hedging Instrument | Cash Flow Hedging | Fixed Interest Rate Swaps Effective in March 2023
Derivative [Line Items]
Derivative notional amount	200,000,000.0		200,000,000.0
Designated as Hedging Instrument | Cash Flow Hedging | Fixed Interest Rate Swaps Effective in May 2023
Derivative [Line Items]
Derivative notional amount	$ 50,000,000.0		$ 50,000,000.0

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Derivative weighted average pay rate.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement, deducted from derivative liabilities.

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Nominal or face amount used to calculate payment on derivative.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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