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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 1,922,899 $ 1,755,273 $ 1,824,002 $ 1,716,068
Ending balance 1,982,332 1,832,011 1,982,332 1,832,011
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (88,985) (122,139) (116,718) (101,015)
Net change 20,965 43,304 48,698 22,180
Ending balance (68,020) (78,835) (68,020) (78,835)
Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (97,979) (129,292) (122,132) (112,844)
Net change 21,677 38,033 45,830 21,585
Ending balance (76,302) (91,259) (76,302) (91,259)
Unamortized Gain on Held-to-Maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 6,869 9,335 8,088 10,580
Net change (636) (619) (1,855) (1,864)
Ending balance 6,233 8,716 6,233 8,716
Net Unrealized Gain (Loss) on Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 2,125 (2,182) (2,674) 1,249
Net change (76) 5,890 4,723 2,459
Ending balance $ 2,049 $ 3,708 $ 2,049 $ 3,708