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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net income $ 533,675 $ 348,715 $ 336,752
Available for sale securities:      
Unrealized (losses) gains arising during the period (150,783) 109,221 (548,193)
Income tax benefit (expense) related to unrealized (losses) gains 39,204 (28,411) 140,995
Reclassification adjustment for net realized gains in earnings (24) (13) (2)
Income tax expense related to realized gains 6 3 1
Net change in unrealized (losses) gains for available for sale securities (111,597) 80,800 (407,199)
Junior subordinated debentures, at fair value:      
Unrealized (losses) gains arising during the period (14,812) 7,866 (28,842)
Income tax benefit (expense) related to unrealized (losses) gains 3,851 (2,045) 7,418
Net change in unrealized (losses) gains for junior subordinated debentures, at fair value (10,961) 5,821 (21,424)
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 973 136 0
Income tax expense related to unrecognized actuarial loss (253) (35) 0
Net change in pension plan liability adjustment 720 101 0
Other comprehensive (loss) income, net of tax (121,838) 86,722 (428,623)
Comprehensive income (loss) $ 411,837 $ 435,437 $ (91,871)