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Accumulated Other Comprehensive Loss - Changes (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Pre-tax Amount |  |
Other comprehensive income , Pre-tax Amount | $ 41,219 | $ 8,770
Income Tax Benefit (Expense) |  |
Other comprehensive loss, Income Tax Benefit (Expense) | (10,994) | (2,340)
Net of Tax |  |
Balance at beginning of period | 2,617,486 | 2,486,066
Other comprehensive income | 30,225 | 6,430
Balance at end of period | 2,648,852 | 2,513,761
Accumulated Other Comprehensive Income (Loss) |  |
Pre-tax Amount |  |
Accumulated other comprehensive loss, beginning balance, Pre-tax Amount | (632,793) | (723,100)
Accumulated other comprehensive loss, ending balance, Pre-tax Amount | (591,574) | (714,330)
Income Tax Benefit (Expense) |  |
Accumulated other comprehensive loss, beginning balance, Income Tax Benefit (Expense) | 168,799 | 192,890
Accumulated other comprehensive loss, ending balance, Income Tax Benefit (Expense) | 157,805 | 190,550
Net of Tax |  |
Balance at beginning of period | (463,994) | (530,210)
Other comprehensive income | 30,225 | 6,430
Balance at end of period | (433,769) | (523,780)
Investment securities |  |
Pre-tax Amount |  |
Unrealized net gains (losses) arising during the year, Pre-tax Amount | 31,363 | (3,432)
Reclassification of net losses (gains) to net income, Pre-tax Amount | (37) |
Other comprehensive income , Pre-tax Amount | 40,983 | 7,728
Income Tax Benefit (Expense) |  |
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense) | (8,365) | 915
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) | 10 |
Other comprehensive loss, Income Tax Benefit (Expense) | (10,931) | (2,061)
Net of Tax |  |
Unrealized net gains (losses) arising during the year, Net of tax | 22,998 | (2,517)
Reclassification of net gains (losses) to net income, Net of tax | (27) |
Other comprehensive income | 30,052 | 5,667
Amortization of unrealized holding losses on held-to-maturity securities |  |
Pre-tax Amount |  |
Reclassification of net losses (gains) to net income, Pre-tax Amount | 9,657 | 11,160
Income Tax Benefit (Expense) |  |
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) | (2,576) | (2,976)
Net of Tax |  |
Reclassification of net gains (losses) to net income, Net of tax | 7,081 | 8,184
Cash flow derivative hedges |  |
Pre-tax Amount |  |
Unrealized net gains (losses) arising during the year, Pre-tax Amount | 236 | (713)
Reclassification of net losses (gains) to net income, Pre-tax Amount |  | 1,755
Other comprehensive income , Pre-tax Amount | 236 | 1,042
Income Tax Benefit (Expense) |  |
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense) | (63) | 189
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) |  | (468)
Other comprehensive loss, Income Tax Benefit (Expense) | (63) | (279)
Net of Tax |  |
Balance at beginning of period | (85) | (803)
Unrealized net gains (losses) arising during the year, Net of tax | 173 | (524)
Reclassification of net gains (losses) to net income, Net of tax |  | 1,287
Other comprehensive income | 173 | 763
Balance at end of period | $ 88 | $ (40)

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