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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Other Comprehensive Income (Loss), Before Tax | $ (7,339) | $ 9,804 | $ 10,539
Other Comprehensive Income (Loss), Tax Effect | (1,540) | 2,059 | 2,213
Other Comprehensive Income (Loss), Net of Tax | (5,799) | 7,745 | 8,326
Net unrealized Gains (Losses) on Investment Securities [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications, Before Tax | (8,570) | 10,935 | 13,368
Amounts reclassified from accumulated other comprehensive income (loss), Before Tax | (1) | (94) | (32)
Other Comprehensive Income (Loss), Before Tax | (8,571) | 10,841 | 13,336
Other comprehensive income (loss) before reclassifications, Tax Effect | (1,799) | 2,297 | 2,807
Amounts reclassified from accumulated other comprehensive income (loss), Tax Effect | 0 | (20) | (7)
Other Comprehensive Income (Loss), Tax Effect | (1,799) | 2,277 | 2,800
Other comprehensive income (loss) before reclassifications, Net of Tax | (6,771) | 8,638 | 10,561
Amounts reclassified from accumulated other comprehensive income (loss), Net of Tax | (1) | (74) | (25)
Other Comprehensive Income (Loss), Net of Tax | (6,772) | 8,564 | 10,536
Defined Benefit Plans [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications, Before Tax | 992 | (1,326) | (2,953)
Amounts reclassified from accumulated other comprehensive income (loss), Before Tax | 240 | 289 | 156
Other Comprehensive Income (Loss), Before Tax | 1,232 | (1,037) | (2,797)
Other comprehensive income (loss) before reclassifications, Tax Effect | 209 | (279) | (620)
Amounts reclassified from accumulated other comprehensive income (loss), Tax Effect | 50 | 61 | 33
Other Comprehensive Income (Loss), Tax Effect | 259 | (218) | (587)
Other comprehensive income (loss) before reclassifications, Net of Tax | 783 | (1,047) | (2,333)
Amounts reclassified from accumulated other comprehensive income (loss), Net of Tax | 190 | 228 | 123
Other Comprehensive Income (Loss), Net of Tax | $ 973 | $ (819) | $ (2,210)

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 + Details
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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e640-108580 + Details
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