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Accumulated Other Comprehensive Income - Schedule of Changes In Each Component of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | $ 701,106 | $ 657,983
Other comprehensive (loss) income, net of tax | (15,605) | 21,620
Ending balance | 691,685 | 685,228
Defined Benefit Pension Plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | (5,661) | (6,270)
Ending balance | (5,661) | (6,270)
Securities available-for-sale: |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 36,894 | 12,110
Other comprehensive income before reclassifications | (15,390) | 20,471
Amounts reclassified from other comprehensive income | (215) | (48)
Reclassification of unrealized gains on held-to-maturity securities to available-for-sale |  | 1,197
Other comprehensive (loss) income, net of tax | (15,605) | 21,620
Ending balance | 21,289 | 33,730
Total |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 31,233 | 5,840
Other comprehensive income before reclassifications | (15,390) | 20,471
Amounts reclassified from other comprehensive income | (215) | (48)
Reclassification of unrealized gains on held-to-maturity securities to available-for-sale |  | 1,197
Other comprehensive (loss) income, net of tax | (15,605) | 21,620
Ending balance | $ 15,628 | $ 27,460

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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 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 2: 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 3: 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=121641772&loc=SL7669686-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121640130&loc=d3e1436-108581 Reference 5: 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 + Details
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