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Other Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning balance | $ 355,212 | $ 350,108 | $ 330,126
Net current-period other comprehensive income (loss) | (66,865) | (5,799) | 7,745
Ending balance | 334,835 | 355,212 | 350,108
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning balance | 14,675 | 21,447 | 12,883
Other comprehensive income (loss) before classifications | (67,438) | (6,771) | 8,638
Amounts reclassified from accumulated other comprehensive income (loss) | (8) | (1) | (74)
Net current-period other comprehensive income (loss) | (67,446) | (6,772) | 8,564
Ending balance | (52,771) | 14,675 | 21,447
Defined Benefit Pension Items [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning balance | (5,855) | (6,828) | (6,009)
Other comprehensive income (loss) before classifications | 581 | 783 | (1,047)
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 190 | 228
Net current-period other comprehensive income (loss) | 581 | 973 | (819)
Ending balance | (5,274) | (5,855) | (6,828)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning balance | 8,820 | 14,619 | 6,874
Other comprehensive income (loss) before classifications | (66,857) | (5,988) | 7,591
Amounts reclassified from accumulated other comprehensive income (loss) | (8) | 189 | 154
Net current-period other comprehensive income (loss) | (66,865) | (5,799) | 7,745
Ending balance | $ (58,045) | $ 8,820 | $ 14,619

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- Definition Amount after tax, before 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 17 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 3: 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 4: 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 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=124507222&loc=d3e1436-108581 Reference 6: 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 7: 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 + Details
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