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Accumulated Other Comprehensive Income (Loss) - Summary of Changes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | $ 1,786,437 | $ 1,408,260 | $ 1,303,463
Other comprehensive income before reclassifications | 55,577 | 52,436 |
Amounts reclassified from accumulated other comprehensive income | (8,615) | (3,140) |
Period change | 46,962 | 49,296 | (17,888)
Ending balance | 1,875,645 | 1,786,437 | 1,408,260
Total |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | 27,874 | (21,422) | (2,908)
Period change | 46,962 | 49,296 | (17,888)
Ending balance | 74,836 | 27,874 | (21,422)
Unrealized Gains (Losses) on Securities Available for Sale |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | 38,872 | (6,343) |
Other comprehensive income before reclassifications | 58,513 | 48,703 |
Amounts reclassified from accumulated other comprehensive income | (9,397) | (3,488) |
Period change | 49,116 | 45,215 |
Ending balance | 87,988 | 38,872 | (6,343)
Unrealized Gains (Losses) on Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | (1,141) | (559) |
Other comprehensive income before reclassifications | (1,169) | (846) |
Amounts reclassified from accumulated other comprehensive income | 716 | 264 |
Period change | (453) | (582) |
Ending balance | (1,594) | (1,141) | (559)
Unrealized Gains (Losses) on Defined Benefit Plans |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | (9,857) | (14,520) |
Other comprehensive income before reclassifications | (1,767) | 4,579 |
Amounts reclassified from accumulated other comprehensive income | 66 | 84 |
Period change | (1,701) | 4,663 |
Ending balance | $ (11,558) | $ (9,857) | $ (14,520)

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: 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 2: 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 + Details
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