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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - 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 $ 146,182 $ 135,845 $ 390,406 $ 255,184
Available for sale securities:        
Unrealized gains (losses) arising during the period 301,772 (333,993) 139,539 (334,298)
Income tax (expense) benefit related to unrealized gains (losses) (78,461) 86,837 (36,280) 86,904
Reclassification adjustment for net realized gains in earnings (3) (4) (14) (4)
Income tax expense related to realized gains 1 1 4 1
Net change in unrealized gains (losses) for available for sale securities 223,309 (247,159) 103,249 (247,397)
Junior subordinated debentures, at fair value:        
Unrealized (losses) gains arising during the period (2,061) (19,677) 4,008 (8,503)
Income tax benefit (expense) related to unrealized (losses) gains 536 5,116 (1,042) 2,211
Net change in unrealized (losses) gains for junior subordinated debentures, at fair value (1,525) (14,561) 2,966 (6,292)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent [Abstract]        
Amortization of unrecognized net actuarial loss included in net periodic pension cost 19 72 58 168
Income tax expense related to unrecognized actuarial loss (5) (19) (15) (44)
Net change in pension plan liability adjustment 14 53 43 124
Other comprehensive income (loss), net of tax 221,798 (261,667) 106,258 (253,565)
Comprehensive income (loss) $ 367,980 $ (125,822) $ 496,664 $ 1,619