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Other Comprehensive Income - Accumulated Balances for Each Component of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss $ 2,354,701 $ 2,322,350 $ 2,297,383 $ 2,208,628 $ 2,187,300 $ 2,136,016
Accumulated Other Comprehensive Loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss (154,116) $ (156,943) (154,256) $ (191,461) $ (192,324) $ (209,037)
Unrealized losses on securities            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss (162,791)   (163,484)      
Unrealized gains on derivative instruments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss 16,340   17,051      
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss $ (7,665)   $ (7,823)