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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, 2018 Employee shares | Dec. 31, 2017 Employee shares | Dec. 31, 2016 Employee shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issuance of shares of restricted stock, Shares | shares | 33,000 | 32,000 | 32,300
Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted shares vested | shares | 28,790 | 24,230 | 20,050
Restricted shares awarded due to retirement | shares |  | 640 | 2,394
Restricted shares forfeited | shares | 2,620 | 1,080 | 1,546
Restricted shares issued | Employee | 80 | 74 | 74
Restricted shares vested | Employee | 56 | 52 | 45
Restricted shares awarded due to retirement | Employee |  | 1 | 4
Restricted shares forfeited | Employee | 5 | 2 | 2

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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 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 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=109197908&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=109259400&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=27012166&loc=d3e187085-122770 + Details
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