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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AFS Debt Securities:      
Unrealized holdings losses, pre-tax amount $ (38,832) $ 33,198 $ 26,743
Unrealized holdings losses, tax (expense) benefit 8,349 (7,138) (5,750)
Unrealized holdings losses, after-tax amount (30,483) 26,060 20,993
Less: reclassification adjustment for realized losses, pre-tax amount 0 0 (105)
Less: reclassification adjustment for realized losses, tax (expense) benefit 0 0 22
Less: reclassification adjustment for realized losses, after-tax amount 0 0 (83)
Net unrealized losses, pre-tax amount (38,832) 33,198 26,848
Net unrealized losses, tax (expense) benefit 8,349 (7,138) (5,772)
Net unrealized losses, after-tax amount (30,483) 26,060 21,076
Cash Flow Hedges:      
Net increase in fair value, pre-tax amount 2,987 1,214 (2,973)
Net increase in fair value, tax (expense) benefit (642) (260) 639
Net increase in fair value, after-tax amount 2,345 954 (2,334)
Net increase in fair value, pre-tax amount 3,627 1,811 (2,052)
Net increase in fair value, tax (expense) benefit (780) (389) 441
Net increase in fair value, after-tax amount 2,847 1,422 (1,611)
Postretirement Plans:      
Net actuarial loss, pre-tax amount (20) (1,282) (1,918)
Net actuarial loss, tax (expense) benefit 4 277 412
Net actuarial loss, after-tax amount (16) (1,005) (1,506)
Less: Amortization of net actuarial losses, pre-tax amount (894) (701) (271)
Less: Amortization of net actuarial losses, tax (expense) benefit 192 151 59
Less: Amortization of net prior service credits, after-tax amount (702) (550) (212)
Less: Amortization of net prior service credits, pre-tax amount 24 24 24
Less: Amortization of net prior service credits, tax (expense) benefit (5) (5) (5)
Less: Amortization of net prior service credits, after-tax amount 19 19 19
Net loss on postretirement plans, pre-tax amount 850 (605) (1,671)
Net loss on postretirement plans, tax (expense) benefit (183) 131 358
Net (loss) gain on postretirement plans, net of tax 667 (474) (1,313)
Other comprehensive income, pre-tax amount (34,355) 34,404 23,125
Other comprehensive income, tax (expense) benefit 7,386 (7,396) (4,973)
Other comprehensive (loss) income (26,969) 27,008 18,152
Interest Expense, Borrowings and Subordinated Debentures      
Cash Flow Hedges:      
Less: effective portion reclassified into interest expense, pre-tax amount (2,254) (1,603) (707)
Less: effective portion reclassified into interest expense, tax (expense) benefit 485 345 151
Less: effective portion reclassified into interest expense, after-tax amount (1,769) (1,258) (556)
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Less: effective portion reclassified into interest expense, pre-tax amount (2,254) (1,603) (707)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax (485) (345) (151)
Less: Amounts reclassified from AOCI (1,769) (1,258) (556)
Interest Income, Interest and Fees on Loans      
Cash Flow Hedges:      
Less: effective portion reclassified into interest expense, pre-tax amount 1,614 1,006 (214)
Less: effective portion reclassified into interest expense, tax (expense) benefit (347) (216) 47
Less: effective portion reclassified into interest expense, after-tax amount 1,267 790 (167)
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Less: effective portion reclassified into interest expense, pre-tax amount 1,614 1,006 (214)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax 347 216 (47)
Less: Amounts reclassified from AOCI $ 1,267 $ 790 $ (167)