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Shareholders' Equity - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 1,868,073 $ 1,731,725 $ 1,824,002 $ 1,716,068
Ending balance 1,922,899 1,755,273 1,922,899 1,755,273
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (101,391) (115,391) (116,718) (101,015)
Net change 12,406 (6,748) 27,733 (21,124)
Ending balance (88,985) (122,139) (88,985) (122,139)
Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (109,327) (123,917) (122,132) (112,844)
Net change 11,348 (5,375) 24,153 (16,448)
Ending balance (97,979) (129,292) (97,979) (129,292)
Unamortized Gain on Held-to-Maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 7,476 9,954 8,088 10,580
Net change (607) (619) (1,219) (1,245)
Ending balance 6,869 9,335 6,869 9,335
Net Unrealized Gain (Loss) on Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 460 (1,428) (2,674) 1,249
Net change 1,665 (754) 4,799 (3,431)
Ending balance $ 2,125 $ (2,182) $ 2,125 $ (2,182)