Comprehensive Loss - Schedule of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Before-Tax Amount
Other comprehensive (loss) income, before tax	$ (6,697)	$ (26,203)	$ (3,945)	$ (66,388)
Tax (Expense) Benefit
Other comprehensive (loss) income, tax	1,726	6,697	1,016	16,971
Net-of-Tax Amount
Other comprehensive (loss) income before reclassifications	(5,161)	(20,023)	(3,445)	(50,027)
Reclassification from AOCI, current period	190	517	516	610
Other Comprehensive Loss	(4,971)	(19,506)	(2,929)	(49,417)
Unrealized Gains and Losses on Available for Sale Securities
Before-Tax Amount
OCI, before reclassifications	(7,796)	(27,945)	(4,763)	(70,945)
Tax (Expense) Benefit
Other comprehensive (loss) income before reclassifications, tax	2,010	7,144	1,227	18,137
Net-of-Tax Amount
Other comprehensive (loss) income before reclassifications	(5,786)	(20,801)	(3,536)	(52,808)
Reclassification from AOCI, current period	0	0	0	0
Other Comprehensive Loss	(5,786)	(20,801)	(3,536)	(52,808)
Unrealized Gain on Cash Flow Swap
Before-Tax Amount
OCI, before reclassifications	846	1,046	125	3,737
Reclassification from AOCI, current period	242	75	660	57
Tax (Expense) Benefit
Other comprehensive (loss) income before reclassifications, tax	(221)	(268)	(34)	(956)
Reclassification from AOCI, current period	(61)	(20)	(169)	(15)
Net-of-Tax Amount
Other comprehensive (loss) income before reclassifications	625	778	91	2,781
Reclassification from AOCI, current period	181	55	491	42
Other Comprehensive Loss	806	833	582	2,823
Amortization of Net Retirement Plan Actuarial Gain (Loss)
Before-Tax Amount
Reclassification from AOCI, current period	(40)	564	(121)	592
Tax (Expense) Benefit
Reclassification from AOCI, current period	10	(144)	31	(151)
Net-of-Tax Amount
Other comprehensive (loss) income before reclassifications	0	0	0	0
Reclassification from AOCI, current period	(30)	420	(90)	441
Other Comprehensive Loss	(30)	420	(90)	441
Amortization of Defined Benefit Pension, Prior-Service Costs
Before-Tax Amount
Reclassification from AOCI, current period	51	57	154	171
Tax (Expense) Benefit
Reclassification from AOCI, current period	(12)	(15)	(39)	(44)
Net-of-Tax Amount
Other comprehensive (loss) income before reclassifications	0	0	0	0
Reclassification from AOCI, current period	39	42	115	127
Other Comprehensive Loss	$ 39	$ 42	$ 115	$ 127

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