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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, 2024
Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 1,716,068 $ 1,522,263
Ending balance 1,731,725 1,592,820
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (101,015) (130,332)
Net change (14,376) 24,357
Ending balance (115,391) (105,975)
Net Unrealized Loss on Available-for-Sale Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (112,844) (144,549)
Net change (11,073) 23,693
Ending balance (123,917) (120,856)
Unamortized Gain on Held-to-Maturity Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 10,580 13,185
Net change (626) (638)
Ending balance 9,954 12,547
Net Unrealized Gain (Loss) on Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 1,249 1,032
Net change (2,677) 1,302
Ending balance $ (1,428) $ 2,334