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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net income $ 111,048 $ 76,215 $ 104,131
Unrealized gains (losses) on securities available for sale:      
Unrealized holding gains (losses) arising during the period, pretax 102,306 (5,316) 43,343
Tax (expense) benefit (24,607) 2,043 (9,279)
Reclassification to realized losses 71,627 37,981 0
Tax benefit (16,508) (8,869) 0
Postretirement plans:      
Net (losses) gains arising during period (102) 111 (607)
Tax benefit (expense) 23 (26) 141
Amortization of unrecognized net actuarial (losses) gains (111) 100 (545)
Tax benefit (expense) 26 (23) 126
Reclassification of net actuarial losses due to settlement to realized losses 0 0 998
Tax benefit 0 0 (232)
Other comprehensive income (loss) 132,654 26,001 33,945
Comprehensive income (loss) $ 243,702 $ 102,216 $ 138,076