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Employee Stock Ownership Plan - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jan. 31, 2021 | Dec. 31, 2020 | Apr. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |  |  |  |
Note payable balance of ESOP | $ 5,600,000 |  | $ 5,600,000 |  | $ 3,000,000.0 | $ 2,600,000 | $ 3,000,000.0
Shares purchased by ESOP |  |  |  |  | 225,721 |  | 295,499
ESOP expense | $ 71,000 | $ 20,000 | $ 193,000 | $ 71,000 |  |  |
ESOP released shares | 47,200 |  | 47,200 |  |  | 47,200 |

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- Definition Employee stock ownership plan ESOP number of released shares. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition 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 to the employer relating to loans made by the employer to the ESOP. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109244457&loc=d3e16545-113920 + Details
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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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