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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Statement of Comprehensive Income [Abstract]    
Net income $ 86,609 $ 124,080
Available for sale securities:    
Unrealized gains (losses) arising during the period 130,309 (122,662)
Income tax (expense) benefit related to unrealized gains (losses) (33,881) 31,893
Reclassification adjustment for net realized gains in earnings (4) (12)
Income tax expense related to realized gains 1 3
Net change in unrealized gains (losses) for available for sale securities 96,425 (90,778)
Junior subordinated debentures, at fair value:    
Unrealized gains arising during the period 9,551 6,453
Income tax expense related to unrealized gains (2,483) (1,678)
Net change in unrealized gains for junior subordinated debentures, at fair value 7,068 4,775
Pension plan liability adjustment:    
Amortization of unrecognized net actuarial loss included in net periodic pension cost 20 19
Income tax expense related to amortization of unrecognized net actuarial loss (5) (5)
Net change in pension plan liability adjustment 15 14
Other comprehensive income (loss), net of tax 103,508 (85,989)
Comprehensive income $ 190,117 $ 38,091