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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Other comprehensive income (loss), before tax | $ (84,791) | $ (7,339) | $ 9,804
Other comprehensive income (loss), Tax Effect | (17,926) | (1,540) | 2,059
Other comprehensive income (loss), Net of Tax | (66,865) | (5,799) | 7,745
Net unrealized Gains (Losses) on Investment Securities [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | (85,517) | (8,570) | 10,935
Amounts reclassified from accumulated other comprehensive income (loss), Before Tax | (10) | (1) | (94)
Other comprehensive income (loss), before tax | (85,527) | (10,841) | 8,571
Other comprehensive income (loss) before reclassifications | (18,079) | (1,799) | 2,297
Amounts reclassified from accumulated other comprehensive income (loss), Tax Effect | (2) | 0 | (20)
Other comprehensive income (loss), Tax Effect | (18,081) | (2,277) | 1,799
Other comprehensive income (loss) before reclassifications, Net of Tax | (67,438) | (6,771) | 8,638
Amounts reclassified from accumulated other comprehensive income (loss), Net of Tax | (8) | (1) | (74)
Other comprehensive income (loss), Net of Tax | (67,446) | (8,564) | 6,772
Defined Benefit Plans [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | 736 | 992 | (1,326)
Amounts reclassified from accumulated other comprehensive income (loss), Before Tax | 0 | 240 | 289
Other comprehensive income (loss), before tax | 736 | 1,232 | (1,037)
Other comprehensive income (loss) before reclassifications | 155 | 209 | (279)
Amounts reclassified from accumulated other comprehensive income (loss), Tax Effect | 0 | 50 | 61
Other comprehensive income (loss), Tax Effect | 155 | 259 | (218)
Other comprehensive income (loss) before reclassifications, Net of Tax | 581 | 783 | (1,047)
Amounts reclassified from accumulated other comprehensive income (loss), Net of Tax | 0 | 190 | 228
Other comprehensive income (loss), Net of Tax | $ 581 | $ 973 | $ (819)

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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 https://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 https://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 https://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 https://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 https://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 https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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