Shareholders' Equity - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,731,725	$ 1,592,820	$ 1,716,068	$ 1,522,263
Ending balance	1,755,273	1,618,233	1,755,273	1,618,233
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(115,391)	(105,975)	(101,015)	(130,332)
Net change	(6,748)	(17,490)	(21,124)	6,867
Ending balance	(122,139)	(123,465)	(122,139)	(123,465)
Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(123,917)	(120,856)	(112,844)	(144,549)
Net change	(5,375)	(13,677)	(16,448)	10,016
Ending balance	(129,292)	(134,533)	(129,292)	(134,533)
Unamortized Gain on Held-to-Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	9,954	12,547	10,580	13,185
Net change	(619)	(686)	(1,245)	(1,324)
Ending balance	9,335	11,861	9,335	11,861
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,428)	2,334	1,249	1,032
Net change	(754)	(3,127)	(3,431)	(1,825)
Ending balance	$ (2,182)	$ (793)	$ (2,182)	$ (793)