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Accumulated Other Comprehensive Loss - Changes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Pre-tax Amount |  |  |  |
Other comprehensive income , Pre-tax Amount | $ 90,656 | $ (49,090) | $ 105,764 | $ (12,924)
Income Tax Benefit (Expense) |  |  |  |
Other comprehensive loss, Income Tax Benefit (Expense) | (24,182) | 13,095 | (28,212) | 3,447
Net of tax |  |  |  |
Balance | 2,550,312 | 2,359,738 | 2,486,066 | 2,269,005
Other comprehensive income (loss) | 66,474 | (35,995) | 77,552 | (9,477)
Balance | 2,648,034 | 2,351,009 | 2,648,034 | 2,351,009
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Pre-tax Amount |  |  |  |
Accumulated other comprehensive loss, beginning balance, Pre-tax Amount | (707,992) | (835,647) | (723,100) | (871,813)
Accumulated other comprehensive loss, ending balance, Pre-tax Amount | (617,336) | (884,737) | (617,336) | (884,737)
Income Tax Benefit (Expense) |  |  |  |
Accumulated other comprehensive loss, beginning balance, Income Tax Benefit (Expense) | 188,860 | 222,911 | 192,890 | 232,559
Accumulated other comprehensive loss, ending balance, Income Tax Benefit (Expense) | 164,678 | 236,006 | 164,678 | 236,006
Net of tax |  |  |  |
Balance | (519,132) | (612,736) | (530,210) | (639,254)
Other comprehensive income (loss) | 66,474 | (35,995) | 77,552 | (9,477)
Balance | (452,658) | (648,731) | (452,658) | (648,731)
Investment securities |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | 76,226 | (61,874) | 68,517 | (50,861)
Other comprehensive income , Pre-tax Amount | 90,148 | (50,440) | 104,264 | (14,655)
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the period, Income Tax Benefit (Expense) | (20,333) | 16,505 | (18,277) | 13,567
Other comprehensive loss, Income Tax Benefit (Expense) | (24,047) | 13,455 | (27,812) | 3,909
Net of tax |  |  |  |
Unrealized net gains (losses) arising during the period, Net of tax | 55,893 | (45,369) | 50,240 | (37,294)
Other comprehensive income (loss) | 66,101 | (36,985) | 76,452 | (10,746)
Amortization of unrealized holding losses on held-to-maturity securities |  |  |  |
Pre-tax Amount |  |  |  |
Reclassification of net losses (gains) to net income, Pre-tax Amount | 13,922 | 11,434 | 35,747 | 36,206
Income Tax Benefit (Expense) |  |  |  |
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) | (3,714) | (3,050) | (9,535) | (9,658)
Net of tax |  |  |  |
Reclassification of net gains (losses) to net income, Net of tax | 10,208 | 8,384 | 26,212 | 26,548
Cash flow derivative hedges |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | 501 | (373) | (325) | (2,868)
Reclassification of net losses (gains) to net income, Pre-tax Amount | 7 | 1,723 | 1,825 | 4,599
Other comprehensive income , Pre-tax Amount | 508 | 1,350 | 1,500 | 1,731
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the period, Income Tax Benefit (Expense) | (133) | 100 | 87 | 765
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) | (2) | (460) | (487) | (1,227)
Other comprehensive loss, Income Tax Benefit (Expense) | (135) | (360) | (400) | (462)
Net of tax |  |  |  |
Balance | (76) | (4,423) | (803) | (4,702)
Unrealized net gains (losses) arising during the period, Net of tax | 368 | (273) | (238) | (2,103)
Reclassification of net gains (losses) to net income, Net of tax | 5 | 1,263 | 1,338 | 3,372
Other comprehensive income (loss) | 373 | 990 | 1,100 | 1,269
Balance | $ 297 | $ (3,433) | $ 297 | $ (3,433)

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