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Shareholders' Equity - Change in AOCI Components Net of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | $ 1,374,507 | $ 1,286,832 | $ 1,268,200
Other Comprehensive Income (Loss) | (74,204) | 38,934 | 19,931
Balance at End of Period | 1,611,611 | $ 1,374,507 | 1,286,832
Accounting Standards Update Extensible List |  | Accounting Standards Update 2016-13 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period |  | $ 3,632 |
Balance at End of Period |  |  | 3,632
Unrealized Gains and Losses on Net Investment Securities | Available-for-sale Securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | 51,495 | 8,359 | (10,447)
Other Comprehensive Income (Loss) Before Reclassifications | (81,644) | 43,163 | 22,168
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2,791) | (27) | (103)
Other Comprehensive Income (Loss) | (84,435) | 43,136 | 18,806
Balance at End of Period | (32,940) | 51,495 | $ 8,359
Accounting Standards Update Extensible List |  |  | us-gaap:AccountingStandardsUpdate201904Member
Unrealized Gains and Losses on Net Investment Securities | Available-for-sale Securities | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period |  |  | $ (3,259)
Unrealized Gains and Losses on Net Investment Securities | Held-to-maturity Securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | (423) | (715) | (4,586)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 477 | 292 | 612
Other Comprehensive Income (Loss) | 477 | 292 | 3,871
Balance at End of Period | 54 | (423) | $ (715)
Accounting Standards Update Extensible List |  |  | us-gaap:AccountingStandardsUpdate201904Member
Unrealized Gains and Losses on Net Investment Securities | Held-to-maturity Securities | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period |  |  | $ 3,259
Defined Benefit Plans |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | (43,250) | (38,756) | (36,010)
Other Comprehensive Income (Loss) Before Reclassifications | 7,968 | (6,017) | (3,709)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 1,786 | 1,523 | 963
Other Comprehensive Income (Loss) | 9,754 | (4,494) | (2,746)
Balance at End of Period | (33,496) | (43,250) | (38,756)
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | 7,822 | (31,112) | (51,043)
Other Comprehensive Income (Loss) Before Reclassifications | (73,676) | 37,146 | 18,459
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (528) | 1,788 | 1,472
Other Comprehensive Income (Loss) | (74,204) | 38,934 | 19,931
Balance at End of Period | $ (66,382) | $ 7,822 | $ (31,112)

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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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