Comprehensive Loss - Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Before-Tax Amount
Other comprehensive income (loss), before tax	$ (28,408)	$ (3,062)
Tax (Expense) Benefit
Other comprehensive income (loss), tax	7,264	782
Net-of-Tax Amount
Other comprehensive income (loss) before reclassifications	(21,171)	(2,337)
Reclassification from AOCI, current period	27	57
Other Comprehensive Loss	(21,144)	(2,280)
Unrealized Gains and Losses on Available for Sale Securities
Before-Tax Amount
OCI, before reclassifications	(29,955)	(5,121)
Tax (Expense) Benefit
Other comprehensive income (loss) before reclassifications, tax	7,659	1,309
Net-of-Tax Amount
Other comprehensive income (loss) before reclassifications	(22,296)	(3,812)
Reclassification from AOCI, current period	0	0
Other Comprehensive Loss	(22,296)	(3,812)
Unrealized Loss on Cash Flow Swap
Before-Tax Amount
OCI, before reclassifications	1,512	1,982
Reclassification from AOCI, current period	(29)	(28)
Tax (Expense) Benefit
Other comprehensive income (loss) before reclassifications, tax	(387)	(507)
Reclassification from AOCI, current period	8	8
Net-of-Tax Amount
Other comprehensive income (loss) before reclassifications	1,125	1,475
Reclassification from AOCI, current period	(21)	(20)
Other Comprehensive Loss	1,104	1,455
Amortization of Net Retirement Plan Actuarial Gain (Loss)
Before-Tax Amount
Reclassification from AOCI, current period	57	46
Tax (Expense) Benefit
Reclassification from AOCI, current period	(15)	(12)
Net-of-Tax Amount
Other comprehensive income (loss) before reclassifications	0	0
Reclassification from AOCI, current period	42	34
Other Comprehensive Loss	42	34
Amortization of Defined Benefit Pension, Prior-Service Costs
Before-Tax Amount
Reclassification from AOCI, current period	7	59
Tax (Expense) Benefit
Reclassification from AOCI, current period	(1)	(16)
Net-of-Tax Amount
Other comprehensive income (loss) before reclassifications	0	0
Reclassification from AOCI, current period	6	43
Other Comprehensive Loss	$ 6	$ 43