Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,184,659	$ 1,206,454	$ 1,154,711
Net Change	21,224	(105,035)	(16,061)
Balance at end of period	1,283,445	1,184,659	1,206,454
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(112,125)	(7,090)	8,971
Net Change	21,224	(105,035)	(16,061)
Balance at end of period	(90,901)	(112,125)	(7,090)
Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(80,463)	7,427	26,284
Net Change	15,910	(87,890)	(18,857)
Balance at end of period	(64,553)	(80,463)	7,427
Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(16,806)	0	0
Net Change	5,204	(16,806)	0
Balance at end of period	(11,602)	(16,806)	0
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(14,856)	(14,517)	(17,313)
Net Change	110	(339)	2,796
Balance at end of period	$ (14,746)	$ (14,856)	$ (14,517)