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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]                
Unrealized holding losses on available-for-sale securities during the period, pre-tax $ (75,679)     $ (83,980)     $ (54,088) $ (301,874)
Reclassification adjustment for gains (losses) realized in income on sales, pre-tax [1] 618     5     498 36
Reclassification adjustment for gain realized in income on fair value hedge, pre-tax 776     0     776 0
Net unrealized losses on available-for-sale securities, pre-tax       (83,975)       (301,838)
Change in funded status of post-retirement health plan, pre-tax       (2)       (6)
Net other comprehensive (loss), pre-tax (74,285)     (83,977)     (52,814) (301,844)
Unrealized holding losses on available-for-sale securities during the period, tax 15,893     17,636     11,359 63,394
Reclassification adjustment for gains (losses) realized in income on sales, tax [1] (130)     (1)     (105) (8)
Reclassification adjustment for gain realized in income on fair value hedge, tax (163)           (163)  
Net unrealized losses on available-for-sale securities, tax       17,635       63,386
Change in funded status of post-retirement health plan, tax       0       1
Net other comprehensive (loss), tax 15,600     17,635     11,091 63,387
Unrealized holding losses on available-for-sale securities during the period, after-tax (59,786)     (66,344)     (42,729) (238,480)
Reclassification adjustment for gains (losses) realized in income on sales, after-tax [1] 488     4     393 28
Reclassification adjustment for gain realized in income on fair value hedge, after tax 613           613  
Net unrealized losses on available-for-sale securities, after tax       (66,340)       (238,452)
Change in funded status of post-retirement plan, after tax 0     (2)     0 (5)
Other comprehensive (loss), net of tax $ (58,685) $ (16,834) $ 33,796 $ (66,342) $ (83,320) $ (88,795) $ (41,723) $ (238,457)
[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.