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Employee Benefit Plans - Summary of Restricted Shares Issued, Vested and Forfeited (Detail) | 12 Months Ended
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Dec. 31, 2022 Employee shares | Dec. 31, 2021 Employee shares | Dec. 31, 2020 Employee shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock awards, shares issued | 56,496 | 48,750 | 37,382
Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock awards, shares issued | 56,496 | 48,750 | 37,382
Restricted shares vested | 26,900 | 18,845 | 23,491
Restricted shares awarded due to retirement | 3,775 | 4,425 | 10,890
Restricted shares awarded for other |  |  | 1,050
Restricted shares forfeited | 8,000 | 2,575 | 2,175
Restricted shares issued | Employee | 109 | 96 | 92
Restricted shares vested | Employee | 60 | 50 | 58
Restricted shares awarded due to retirement | Employee | 3 | 7 | 8
Restricted shares awarded for other | Employee |  |  | 1
Restricted shares forfeited | Employee | 9 | 4 | 5

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options vested excludes shares awarded due to retirement. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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