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Shareholders' Equity - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 1,824,002 $ 1,716,068
Ending balance 1,868,073 1,731,725
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (116,718) (101,015)
Net change 15,327 (14,376)
Ending balance (101,391) (115,391)
Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (122,132) (112,844)
Net change 12,805 (11,073)
Ending balance (109,327) (123,917)
Unamortized Gain on Held-to-Maturity Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 8,088 10,580
Net change (612) (626)
Ending balance 7,476 9,954
Net Unrealized Gain (Loss) on Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (2,674) 1,249
Net change 3,134 (2,677)
Ending balance $ 460 $ (1,428)