v3.25.2
Other Comprehensive Income - Accumulated Balances for Each Component of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss $ 3,778,854 $ 2,727,105 $ 2,678,318 $ 2,354,701 $ 2,322,350 $ 2,297,383
Accumulated Other Comprehensive Income (Loss)            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss (114,041) $ (121,621) (142,608) $ (154,116) $ (156,943) $ (154,256)
Unrealized losses on securities            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss (121,828)   (152,934)      
Unrealized gains on derivative instruments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss 14,742   17,429      
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss $ (6,955)   $ (7,103)