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Accumulated Other Comprehensive Loss - Changes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Pre-tax Amount |  |  |  |
Other comprehensive income , Pre-tax Amount | $ 36,496 | $ 6,338 | $ 77,715 | $ 15,108
Income Tax Benefit (Expense) |  |  |  |
Other comprehensive loss, Income Tax Benefit (Expense) | (9,735) | (1,690) | (20,729) | (4,030)
Net of Tax |  |  |  |
Balance at beginning of period | 2,648,852 | 2,513,761 | 2,617,486 | 2,486,066
Other comprehensive income | 26,761 | 4,648 | 56,986 | 11,078
Balance at end of period | 2,694,545 | 2,550,312 | 2,694,545 | 2,550,312
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Pre-tax Amount |  |  |  |
Accumulated other comprehensive loss, beginning balance, Pre-tax Amount | (591,574) | (714,330) | (632,793) | (723,100)
Accumulated other comprehensive loss, ending balance, Pre-tax Amount | (555,078) | (707,992) | (555,078) | (707,992)
Income Tax Benefit (Expense) |  |  |  |
Accumulated other comprehensive loss, beginning balance, Income Tax Benefit (Expense) | 157,805 | 190,550 | 168,799 | 192,890
Accumulated other comprehensive loss, ending balance, Income Tax Benefit (Expense) | 148,070 | 188,860 | 148,070 | 188,860
Net of Tax |  |  |  |
Balance at beginning of period | (433,769) | (523,780) | (463,994) | (530,210)
Other comprehensive income | 26,761 | 4,648 | 56,986 | 11,078
Balance at end of period | (407,008) | (519,132) | (407,008) | (519,132)
Investment securities |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net gains (losses) arising during the year, Pre-tax Amount | 26,354 | (4,277) | 57,717 | (7,709)
Reclassification of net losses (gains) to net income, Pre-tax Amount |  |  | (37) |
Other comprehensive income , Pre-tax Amount | 36,336 | 6,388 | 77,319 | 14,116
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense) | (7,030) | 1,141 | (15,395) | 2,056
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) |  |  | 10 |
Other comprehensive loss, Income Tax Benefit (Expense) | (9,693) | (1,704) | (20,624) | (3,765)
Net of Tax |  |  |  |
Unrealized net gains (losses) arising during the year, Net of tax | 19,324 | (3,136) | 42,322 | (5,653)
Reclassification of net gains (losses) to net income, Net of tax |  |  | (27) |
Other comprehensive income | 26,643 | 4,684 | 56,695 | 10,351
Amortization of unrealized holding losses on held-to-maturity securities |  |  |  |
Pre-tax Amount |  |  |  |
Reclassification of net losses (gains) to net income, Pre-tax Amount | 9,982 | 10,665 | 19,639 | 21,825
Income Tax Benefit (Expense) |  |  |  |
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) | (2,663) | (2,845) | (5,239) | (5,821)
Net of Tax |  |  |  |
Reclassification of net gains (losses) to net income, Net of tax | 7,319 | 7,820 | 14,400 | 16,004
Cash flow derivative hedges |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net gains (losses) arising during the year, Pre-tax Amount | 113 | (113) | 349 | (826)
Reclassification of net losses (gains) to net income, Pre-tax Amount |  | 63 |  | 1,818
Amounts excluded from the assessment of hedge effectiveness, Pre-tax Amount | 47 |  | 47 |
Other comprehensive income , Pre-tax Amount | 160 | (50) | 396 | 992
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense) | (29) | 31 | (92) | 220
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) |  | (17) |  | (485)
Amounts excluded from the assessment of hedge effectiveness, Income Tax Benefit (Expense) | (13) |  | (13) |
Other comprehensive loss, Income Tax Benefit (Expense) | (42) | 14 | (105) | (265)
Net of Tax |  |  |  |
Balance at beginning of period | 88 | (40) | (85) | (803)
Unrealized net gains (losses) arising during the year, Net of tax | 84 | (82) | 257 | (606)
Reclassification of net gains (losses) to net income, Net of tax |  | 46 |  | 1,333
Amounts excluded from the assessment of hedge effectiveness, Net of tax | 34 |  | 34 |
Other comprehensive income | 118 | (36) | 291 | 727
Balance at end of period | $ 206 | $ (76) | $ 206 | $ (76)

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