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Accumulated Other Comprehensive (Loss) Income - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 1,230,575 | $ 893,421 | $ 852,401
Other comprehensive (loss) income before reclassifications | (316,783) | (40,729) | 14,879
Amounts reclassified from accumulated other comprehensive income | (222) | 1,409 | (5,652)
Net current-period other comprehensive income (loss) | (317,005) | (39,320) | 9,227
Ending balance | 1,031,596 | 1,230,575 | 893,421
Unrealized Gain (Loss) on Securities Available for Sale |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (24,698) | 15,749 | 7,504
Other comprehensive (loss) income before reclassifications | (317,319) | (41,400) | 14,425
Amounts reclassified from accumulated other comprehensive income | 0 | 953 | (6,180)
Net current-period other comprehensive income (loss) | (317,319) | (40,447) | 8,245
Ending balance | (342,017) | (24,698) | 15,749
Postretirement Plans (Liability) Asset |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (272) | (1,399) | (2,381)
Other comprehensive (loss) income before reclassifications | 536 | 671 | 454
Amounts reclassified from accumulated other comprehensive income | (222) | 456 | 528
Net current-period other comprehensive income (loss) | 314 | 1,127 | 982
Ending balance | 42 | (272) | (1,399)
Total |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (24,970) | 14,350 | 5,123
Ending balance | $ (341,975) | $ (24,970) | $ 14,350

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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, 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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