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Unaudited Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 92,278 $ 89,208 $ 111,477 $ 240,390
Unrealized gains (losses) on investment securities:        
Unrealized holding gains (losses) arising during period 148,098 (80,361) 129,211 (76,219)
Unrealized gains (losses) on securities with credit loss recognized in earnings 34,702 (25,989) 29,301 (13,032)
Amounts reclassified into net income (loss):        
Net realized (gains) losses on disposals and losses on intent-to-sell available-for-sale securities (986) 3,656 (1,014) 15,891
Credit loss (benefit) expense (1,732) 1,949 1,336 (6,261)
Total unrealized gains (losses) on investment securities 180,082 (100,745) 158,834 (79,621)
Defined benefit pension and post-retirement plans:        
Amounts reclassified into net income (loss): Net actuarial loss 764 598 2,292 1,794
Total defined benefit pension and post-retirement plans 764 598 2,292 1,794
Other comprehensive income (loss) 180,846 (100,147) 161,126 (77,827)
Comprehensive income (loss) $ 273,124 $ (10,939) $ 272,603 $ 162,563