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Comprehensive Income (Loss) - Schedule of Components of Comprehensive Income-Gross and Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net income (loss), Gross $ 116,487 $ 112,517 $ 138,955 $ 301,433
Unrealized holding gains (losses) during the period, Gross 187,465 (101,722) 163,558 (96,478)
Unrealized gains (losses) on securities with credit loss recognized in earnings, Gross 43,927 (32,898) 37,090 (16,497)
Amounts reclassified into net income (loss): net realized (gains) losses on disposals and intent-to-sell AFS securities, Gross (1,249) 4,628 (1,284) 20,115
Amounts reclassified into net income (loss): Credit loss (benefit) expense, Gross (2,191) 2,468 1,692 (7,925)
Total unrealized gains (losses) on investment securities, Gross 227,952 (127,524) 201,056 (100,785)
Amount reclassified into net income (loss): Net actuarial (gain) loss, Gross 967 756 2,901 2,270
Total defined benefit pension and post-retirement plans, Gross 967 756 2,901 2,270
Other comprehensive income (loss), Gross 228,919 (126,768) 203,957 (98,515)
Comprehensive income (loss), Gross 345,406 (14,251) 342,912 202,918
Net income (loss), Tax 24,209 23,309 27,478 61,043
Unrealized holding gains (losses) during the period, Tax 39,367 (21,361) 34,347 (20,259)
Unrealized gains (losses) on securities with credit loss recognized in earnings, Tax 9,225 (6,909) 7,789 (3,465)
Amounts reclassified into net income (loss): net realized (gains) losses on disposals and intent-to-sell AFS securities, Tax (263) 972 (270) 4,224
Amounts reclassified into net income (loss): Credit loss (benefit) expense, Tax (459) 519 356 (1,664)
Total unrealized gains (losses) on investment securities, Tax 47,870 (26,779) 42,222 (21,164)
Amount reclassified into net income (loss): Net actuarial (gain) loss, Tax 203 158 609 476
Total defined benefit pension and post-retirement plans, Tax 203 158 609 476
Other comprehensive income (loss), Tax 48,073 (26,621) 42,831 (20,688)
Comprehensive income (loss), Tax 72,282 (3,312) 70,309 40,355
Net income (loss) 92,278 89,208 111,477 240,390
Unrealized holding gains (losses) during the period, Net 148,098 (80,361) 129,211 (76,219)
Unrealized gains (losses) on securities with credit loss recognized in earnings, Net 34,702 (25,989) 29,301 (13,032)
Amounts reclassified into net income (loss): net realized (gains) losses on disposals and intent-to-sell AFS securities, Net (986) 3,656 (1,014) 15,891
Amounts reclassified into net income (loss): Credit loss (benefit) expense, Net (1,732) 1,949 1,336 (6,261)
Total unrealized gains (losses) on investment securities 180,082 (100,745) 158,834 (79,621)
Amount reclassified into net income (loss): Net actuarial (gain) loss, Net 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