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Shareholders' Equity - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 1,755,273 | $ 1,618,233 | $ 1,716,068 | $ 1,522,263
Ending balance | 1,832,011 | 1,611,880 | 1,832,011 | 1,611,880
Total |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (122,139) | (123,465) | (101,015) | (130,332)
Net change | 43,304 | (44,364) | 22,180 | (37,497)
Ending balance | (78,835) | (167,829) | (78,835) | (167,829)
Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (129,292) | (134,533) | (112,844) | (144,549)
Net change | 38,033 | (41,257) | 21,585 | (31,241)
Ending balance | (91,259) | (175,790) | (91,259) | (175,790)
Unamortized Gain on Held-to-Maturity Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 9,335 | 11,861 | 10,580 | 13,185
Net change | (619) | (647) | (1,864) | (1,971)
Ending balance | 8,716 | 11,214 | 8,716 | 11,214
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (2,182) | (793) | 1,249 | 1,032
Net change | 5,890 | (2,460) | 2,459 | (4,285)
Ending balance | $ 3,708 | $ (3,253) | $ 3,708 | $ (3,253)

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