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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]                
Unrealized holding losses on available-for-sale securities during the period $ (83,980)     $ (2,754)     $ (301,874) $ (8,990)
Reclassification adjustment for (gains) losses included in net income, pre-tax [1] 5     (464)     36 (848)
Net unrealized holding losses (83,975)     (3,218)     (301,838) (9,838)
Change in funded status of post-retirement health plan, pre-tax (2)           (6)  
Net other comprehensive (loss), pre-tax (83,977)     (3,218)     (301,844) (9,838)
Unrealized holding (losses) on available-for-sale securities during the period 17,636     578     63,394 1,888
Tax provision related to net realized gain [1] (1)     96     (8) 178
Net unrealized losses on available-for-sale securities 17,635     674     63,386 2,066
Change in funded status of post-retirement health plan, tax 0           1  
Net other comprehensive (loss), tax 17,635     674     63,387 2,066
Unrealized holding (losses) on available-for-sale securities during the period (66,344)     (2,176)     (238,480) (7,102)
Reclassification adjustment for (gains) losses included in net income, after-tax [1] 4     (368)     28 (670)
Unrealized holding losses, net of reclassification and tax (66,340)     (2,544)     (238,452) (7,772)
Change in funded status of post-retirement plan, net of tax (2)     0     (5) 0
Other comprehensive loss, net of tax $ (66,342) $ (83,320) $ (88,795) $ (2,544) $ 6,872 $ (12,100) $ (238,457) $ (7,772)
[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.