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Employee Stock Ownership Plan - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	May 12, 1998	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 01, 2018	Apr. 30, 2018
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Contributions to ESOP		$ 1,500	$ 1,500
Dividends paid unallocated ESOP shares		313	357
Outstanding loan		$ 8,100	$ 9,300
Unallocated shares of ESOP (in shares)		394,080	459,711
Fair value of unallocated shares		$ 7,300
Shares allocated to participants (in shares)		2,477,663
Shares committed to be released (in shares)		65,631
Employee Stock Ownership Plan
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Minimum age limit for employees to participate in ESOP (years)		21 years
Minimum number of working hours (hours)		1000 hours
ESOP original borrowings		$ 13,400
Purchase of common stock shares (in shares)		2,013,137
Additional borrowings	$ 8,200				$ 8,400
Additional common stock shares (in shares)	633,750				292,592
Fixed interest rate (percent)					3.25%	8.25%
Compensation expense related to ESOP		$ 1,100	$ 1,600	$ 1,600
Increase (decrease) in the average fair value		$ (80)	$ 366	$ 596
Employee Stock Ownership Plan | Minimum
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Extended loan term (years)	12 years
Employee Stock Ownership Plan | Maximum
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Extended loan term (years)	30 years

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Additional Common Stock Issued Shares

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Employee Minimum Age Eligibility To Participate In Plan

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Employee Stock Ownership Plan (ESOP), Number of Unallocated Shares

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Employee Stock Ownership Plan Esop Debt Structure Direct Loan Interest Percentage

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Employee stock ownership plan ESOP minimum work period.

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Shares To Be Purchased For Esop From Borrowed Fund

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The amount reported as a liability as of the balance sheet date by the entity (the employer) of the loan made by a third-party lender directly to the ESOP.

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Fair value of unearned shares held by the employee stock ownership plan (ESOP).

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Dividends paid on stock held by an employee stock ownership plan.

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The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested.

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The shares that, although not legally released, will be released by a future scheduled and committed debt service payment and will be allocated to employees for service rendered in the current accounting period. The ESOP documents typically define the period of service to which the shares relate. ESOP shares are released to compensate employees directly, to settle employer liabilities for other employee benefits, and to replace dividends on allocated shares that are used for debt service.

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