Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,206,454	$ 1,154,711	$ 1,191,998
Other comprehensive income (loss)	(105,035)	(16,061)	20,641
Ending balance	1,184,659	1,206,454	1,154,711
Accumulated Other Comprehensive Income/(Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(7,090)	8,971	(11,670)
Other comprehensive income (loss)	(105,035)	(16,061)	20,641
Ending balance	(112,125)	(7,090)	8,971
Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	7,427	26,284	8,428
Other comprehensive income (loss)	(87,890)	(18,857)	17,856
Ending balance	(80,463)	7,427	26,284
Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	0	0
Other comprehensive income (loss)	(16,806)	0	0
Ending balance	(16,806)	0	0
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(14,517)	(17,313)	(20,098)
Other comprehensive income (loss)	(339)	2,796	2,785
Ending balance	$ (14,856)	$ (14,517)	$ (17,313)