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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net income $ 597,983 $ 380,271 $ 498,511
Unrealized losses and gains on available for sale debt securities      
Net gains (losses) arising during the period 69,346 (18,397) 12,950
Amounts reclassified to earnings (1) 1 (634)
Total 69,345 (18,396) 12,316
Unrealized gains and losses on derivatives (cash flow hedges)      
Net losses on derivatives arising during the period 0 0 (757)
Amounts reclassified to earnings (825) (869) 638
Total (825) (869) (119)
Defined benefit pension and postretirement benefit plans      
Net gains arising during the period 12,882 10,609 5,442
Amortization of prior service cost (99) (97) (90)
Amortization of actuarial net losses (348) (125) (3)
Total 12,435 10,387 5,349
Other comprehensive income (loss) , net 80,955 (8,878) 17,546
Total comprehensive income $ 678,938 $ 371,393 $ 516,057