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Accumulated Other Comprehensive Loss - Changes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Pre-tax Amount |  |  |  |
Other comprehensive income , Pre-tax Amount | $ 6,338 | $ (1,441) | $ 15,108 | $ 36,166
Income Tax Benefit (Expense) |  |  |  |
Other comprehensive loss, Income Tax Benefit (Expense) | (1,690) | 384 | (4,030) | (9,648)
Net of tax |  |  |  |
Balance | 2,513,761 | 2,329,012 | 2,486,066 | 2,269,005
Other comprehensive income (loss) | 4,648 | (1,057) | 11,078 | 26,518
Balance | 2,550,312 | 2,359,738 | 2,550,312 | 2,359,738
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Pre-tax Amount |  |  |  |
Accumulated other comprehensive loss, beginning balance, Pre-tax Amount | (714,330) | (834,206) | (723,100) | (871,813)
Accumulated other comprehensive loss, ending balance, Pre-tax Amount | (707,992) | (835,647) | (707,992) | (835,647)
Income Tax Benefit (Expense) |  |  |  |
Accumulated other comprehensive loss, beginning balance, Income Tax Benefit (Expense) | 190,550 | 222,527 | 192,890 | 232,559
Accumulated other comprehensive loss, ending balance, Income Tax Benefit (Expense) | 188,860 | 222,911 | 188,860 | 222,911
Net of tax |  |  |  |
Balance | (523,780) | (611,679) | (530,210) | (639,254)
Other comprehensive income (loss) | 4,648 | (1,057) | 11,078 | 26,518
Balance | (519,132) | (612,736) | (519,132) | (612,736)
Investment securities |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | (4,277) | (14,025) | (7,709) | 11,013
Other comprehensive income , Pre-tax Amount | 6,388 | (961) | 14,116 | 35,785
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the period, Income Tax Benefit (Expense) | 1,141 | 3,741 | 2,056 | (2,938)
Other comprehensive loss, Income Tax Benefit (Expense) | (1,704) | 256 | (3,765) | (9,546)
Net of tax |  |  |  |
Unrealized net gains (losses) arising during the period, Net of tax | (3,136) | (10,284) | (5,653) | 8,075
Other comprehensive income (loss) | 4,684 | (705) | 10,351 | 26,239
Amortization of unrealized holding losses on held-to-maturity securities |  |  |  |
Pre-tax Amount |  |  |  |
Reclassification of net losses (gains) to net income, Pre-tax Amount | 10,665 | 13,064 | 21,825 | 24,772
Income Tax Benefit (Expense) |  |  |  |
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) | (2,845) | (3,485) | (5,821) | (6,608)
Net of tax |  |  |  |
Reclassification of net gains (losses) to net income, Net of tax | 7,820 | 9,579 | 16,004 | 18,164
Cash flow derivative hedges |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | (113) | (2,053) | (826) | (2,495)
Reclassification of net losses (gains) to net income, Pre-tax Amount | 63 | 1,573 | 1,818 | 2,876
Other comprehensive income , Pre-tax Amount | (50) | (480) | 992 | 381
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the period, Income Tax Benefit (Expense) | 31 | 548 | 220 | 665
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) | (17) | (420) | (485) | (767)
Other comprehensive loss, Income Tax Benefit (Expense) | 14 | 128 | (265) | (102)
Net of tax |  |  |  |
Balance | (40) | (4,071) | (803) | (4,702)
Unrealized net gains (losses) arising during the period, Net of tax | (82) | (1,505) | (606) | (1,830)
Reclassification of net gains (losses) to net income, Net of tax | 46 | 1,153 | 1,333 | 2,109
Other comprehensive income (loss) | (36) | (352) | 727 | 279
Balance | $ (76) | $ (4,423) | $ (76) | $ (4,423)

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