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Unaudited Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 115,340 $ 92,278 $ 311,179 $ 111,477
Unrealized gains (losses) on investment securities:        
Unrealized holding gains (losses) arising during period 53,248 148,098 141,037 129,211
Unrealized gains (losses) on securities with credit loss recognized in earnings 9,585 34,702 28,378 29,301
Amounts reclassified into net income (loss):        
Net realized (gains) losses on disposals and losses on intent-to-sell available-for-sale securities 458 (986) (101) (1,014)
Credit loss (benefit) expense (655) (1,732) (1,853) 1,336
Total unrealized gains (losses) on investment securities 62,636 180,082 167,461 158,834
Amounts reclassified into net income (loss):        
Net actuarial loss 690 764 2,068 2,292
Total defined benefit pension and post-retirement plans 690 764 2,068 2,292
Other comprehensive income (loss) 63,326 180,846 169,529 161,126
Comprehensive income (loss) $ 178,666 $ 273,124 $ 480,708 $ 272,603