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Other Comprehensive Income - Summary of Change in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 243,910 | $ 211,784 | $ 201,913
Comprehensive Income (Loss) | (3,653) | 15 | (2,020)
Reclassification of Disproportionate Tax Effect |  | 0 |
Ending balance | 262,830 | 243,910 | 211,784
AOCI Attributable to Parent |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (343) | (121) | 1,899
Comprehensive Income (Loss) | (3,653) | 15 | (2,020)
Reclassification of Disproportionate Tax Effect | 0 | (237) | 0
Ending balance | (3,996) | (343) | (121)
Unrealized gains (losses) on securities available for sale |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 473 | 1,393 | 3,529
Comprehensive Income (Loss) | (4,007) | (1,004) | (2,136)
Reclassification of Disproportionate Tax Effect | 0 | 84 | 0
Ending balance | (3,534) | 473 | 1,393
Unrealized gain (loss) on postretirement benefits plan |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (690) | (1,217) | (1,153)
Comprehensive Income (Loss) | 386 | 825 | (64)
Reclassification of Disproportionate Tax Effect | 0 | (298) | 0
Ending balance | (304) | (690) | (1,217)
Unrealized loss on interest rate swap |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (126) | (297) | (477)
Comprehensive Income (Loss) | (32) | 194 | 180
Reclassification of Disproportionate Tax Effect | 0 | (23) | 0
Ending balance | $ (158) | $ (126) | $ (297)

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- Definition Tax Cuts and Jobs Act of 2017, reclassification from AOCI to retained earnings tax effect. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 + Details
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