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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 852,401 | $ 764,230 | $ 692,979
Other comprehensive income (loss) before reclassifications | 14,879 | 16,545 | (7,831)
Amounts reclassified from accumulated other comprehensive income | (5,652) | 539 | 16
Net current-period other comprehensive income (loss) | 9,227 | 17,084 | (7,815)
Ending balance | 893,421 | 852,401 | 764,230
Unrealized Gain (Loss) on Securities Available for Sale |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 7,504 | (9,494) | (1,694)
Other comprehensive income (loss) before reclassifications | 14,425 | 17,073 | (7,800)
Amounts reclassified from accumulated other comprehensive income | (6,180) | (75) | 0
Net current-period other comprehensive income (loss) | 8,245 | 16,998 | (7,800)
Ending balance | 15,749 | 7,504 | (9,494)
Postretirement Plans Asset (Liability) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (2,381) | (2,467) | (2,452)
Other comprehensive income (loss) before reclassifications | 454 | (528) | (31)
Amounts reclassified from accumulated other comprehensive income | 528 | 614 | 16
Net current-period other comprehensive income (loss) | 982 | 86 | (15)
Ending balance | (1,399) | (2,381) | (2,467)
Total |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 5,123 | (11,961) | (4,146)
Ending balance | $ 14,350 | $ 5,123 | $ (11,961)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: 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=118930883&loc=SL7669686-108580 Reference 2: 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=118951672&loc=d3e1436-108581 + Details
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