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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ 152,423 $ 120,144 $ 239,032 $ 244,224
Available for sale securities:        
Unrealized gains (losses) arising during the period 35,222 (39,571) 165,531 (162,233)
Income tax (expense) benefit related to unrealized gains (losses) (9,157) 10,288 (43,038) 42,181
Reclassification adjustment for net realized (gains) losses in earnings (1) 1 (5) (11)
Income tax expense related to realized (gains) losses 0 0 1 3
Net change in unrealized gains (losses) for available for sale securities 26,064 (29,282) 122,489 (120,060)
Junior subordinated debentures, at fair value:        
Unrealized gains (losses) arising during the period (1,878) (384) 7,673 6,069
Income tax benefit (expense) related to unrealized (losses) gains 488 100 (1,995) (1,578)
Net change in unrealized gains (losses) for junior subordinated debentures, at fair value (1,390) (284) 5,678 4,491
Pension plan liability adjustment:        
Amortization of unrecognized net actuarial loss included in net periodic pension cost 19 20 39 39
Income tax expense related to amortization of unrecognized net actuarial loss (5) (5) (10) (10)
Net change in pension plan liability adjustment 14 15 29 29
Other comprehensive income (loss), net of tax 24,688 (29,551) 128,196 (115,540)
Comprehensive income $ 177,111 $ 90,593 $ 367,228 $ 128,684