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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, 2021 Employee shares | Dec. 31, 2020 Employee shares | Dec. 31, 2019 Employee shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock awards, shares issued | 48,750 | 37,382 | 38,100
Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock awards, shares issued | 48,750 | 37,382 | 38,100
Restricted shares vested | 18,845 | 23,491 | 26,070
Restricted shares awarded due to retirement | 4,425 | 10,890 | 14,300
Restricted shares awarded for other |  | 1,050 |
Restricted shares forfeited | 2,575 | 2,175 | 3,220
Restricted shares issued | Employee | 96 | 92 | 94
Restricted shares vested | Employee | 50 | 58 | 63
Restricted shares awarded due to retirement | Employee | 7 | 8 | 3
Restricted shares awarded for other | Employee |  | 1 |
Restricted shares forfeited | Employee | 4 | 5 | 4

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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 Share based compensation arrangement by share based payment award number of employee share issued. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award number of employee shares forfeited. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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