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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Comprehensive Income Net Of Tax [Abstract]      
Unrealized holding gains (losses) on available-for-sale securities during the year, pre-tax $ (15,333) $ 16,651 $ 17,513
Reclassification adjustment for gains included in net income, pre-tax [1] (838) (385) 11
Net unrealized holding gains (losses) (16,171) 16,266 17,524
Change in funded status of post-retirement plan, pre-tax 48    
Net other comprehensive income (loss), pre-tax (16,123) 16,266 17,524
Unrealized holding gains (losses) on available-for-sale securities during the year, tax 3,220 (3,970) (3,666)
Tax provision related to net realized gain [1] 176 (90) (2)
Net unrealized gains (losses) on available-for-sale securities, tax 3,396 (4,060) (3,668)
Change in funded status of post-retirement plan, tax (10)    
Net other comprehensive income (loss), tax 3,386 (4,060) (3,668)
Unrealized holding gains (losses) on available-for-sale securities during the year, after tax (12,113) 12,681 13,847
Reclassification adjustment for gains included in net income, after-tax [1] (662) (475) 9
Unrealized holding gains (losses), net of reclassification and tax (12,775) 12,206 13,856
Change in funded status of post-retirement plan, net of tax 38 0 0
Other comprehensive income (loss), net of tax $ (12,737) $ 12,206 $ 13,856
[1] Pre-tax reclassification adjustments relating to available-for-sale securities are reported in security gains and the tax impact is included in income tax expense on the consolidated statements of income.