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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Comprehensive Income Net Of Tax [Abstract]    
Unrealized holding losses on available-for-sale securities during the period $ (112,398) $ (14,934)
Reclassification adjustment for (gains) losses included in net income, pre-tax [1] 0 (383)
Net unrealized holding losses (112,398) (15,317)
Change in funded status of post-retirement health plan, pre-tax (2)  
Net other comprehensive income (loss), pre-tax (112,400) (15,317)
Unrealized holding losses on available-for-sale securities during the period 23,605 3,136
Tax provision related to net realized gain [1] 0 81
Net unrealized losses on available-for-sale securities 23,605 3,217
Change in funded status of post-retirement health plan, tax 0  
Net other comprehensive income (loss), tax 23,605 3,217
Unrealized holding losses on available-for-sale securities during the period (88,793) (11,798)
Reclassification adjustment for (gains) losses included in net income, after-tax [1] 0 (302)
Unrealized holding losses, net of reclassification and tax (88,793) (12,100)
Change in funded status of post-retirement plan, net of tax (2) 0
Other comprehensive loss, net of tax $ (88,795) $ (12,100)
[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.