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Employee Benefit Plans - Summary of Restricted Shares Issued, Vested and Forfeited (Detail) - Restricted Stock Awards [Member] | 12 Months Ended
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Dec. 31, 2024 Employee shares | Dec. 31, 2023 Employee shares | Dec. 31, 2022 Employee shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock awards, shares issued | shares | 60,169 | 64,225 | 56,496
Restricted shares vested | shares | 38,825 | 32,427 | 26,900
Restricted shares awarded due to retirement | shares | 8,700 | 2,350 | 3,775
Restricted shares awarded for other | shares |  | 700 |
Restricted shares forfeited | shares | 5,811 | 6,350 | 8,000
Restricted shares issued | Employee | 111 | 113 | 109
Restricted shares vested | Employee | 74 | 69 | 60
Restricted shares awarded due to retirement | Employee | 2 | 4 | 3
Restricted shares awarded for other | Employee |  | 1 |
Restricted shares forfeited | Employee | 7 | 8 | 9

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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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