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Other Comprehensive Income (Loss) - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale of securities |  |  |  |  |  |  |  |  | $ (413) | $ 12 | $ 19
Other operating expenses |  |  |  |  |  |  |  |  | (8,384) | (6,905) | (6,730)
Income taxes |  |  |  |  |  |  |  |  | (2,640) | (6,360) | (6,619)
Net income | $ 7,569 | $ (3,433) | $ 3,014 | $ 6,989 | $ 3,981 | $ 3,660 | $ 3,596 | $ 4,635 | 14,139 | 15,872 | 17,217
Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | (443) | (239) | (202)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale of securities |  |  |  |  |  |  |  |  | (413) | 12 | 19
Income taxes |  |  |  |  |  |  |  |  | 87 | (4) | (6)
Net income |  |  |  |  |  |  |  |  | (326) | 8 | 13
Accumulated Defined Benefit Plans Adjustment, Actuarial Losses [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | (149) | (380) | (326)
Income taxes |  |  |  |  |  |  |  |  | 32 | 133 | 111
Net income |  |  |  |  |  |  |  |  | $ (117) | $ (247) | $ (215)

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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