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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)