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Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning balance | $ 3,884,905 | $ 2,678,318
Ending balance | 3,866,918 | 2,727,105
Accumulated Other Comprehensive Income (Loss) |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning balance | (89,732) | (142,608)
Other comprehensive income (loss) before reclassification | (14,077) | 27,125
Amounts reclassified from accumulated other comprehensive income | 822 | 929
Tax expense (benefit) | 3,363 | (7,067)
Other comprehensive (loss) income, net of tax | (9,892) | 20,987
Ending balance | (99,624) | (121,621)
Unrealized Holding Gains (Losses) on Available-for-Sale Securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning balance | (56,542) | (103,889)
Other comprehensive income (loss) before reclassification | (15,891) | 26,688
Amounts reclassified from accumulated other comprehensive income | 0 | 0
Tax expense (benefit) | 4,024 | (6,718)
Other comprehensive (loss) income, net of tax | (11,867) | 19,970
Ending balance | (68,409) | (83,919)
Amortization of unrealized holding losses on securities transferred to held to maturity |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning balance | (40,435) | (49,045)
Other comprehensive income (loss) before reclassification | 2,625 | 3,044
Amounts reclassified from accumulated other comprehensive income | 0 | 0
Tax expense (benefit) | (672) | (779)
Other comprehensive (loss) income, net of tax | 1,953 | 2,265
Ending balance | (38,482) | (46,780)
Unrealized Gains (Losses) on Derivative Instruments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning balance | 13,598 | 17,429
Other comprehensive income (loss) before reclassification | (885) | (2,706)
Amounts reclassified from accumulated other comprehensive income | 841 | 929
Tax expense (benefit) | 11 | 455
Other comprehensive (loss) income, net of tax | (33) | (1,322)
Ending balance | 13,565 | 16,107
Defined Benefit Pension and Post-retirement Benefit Plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning balance | (6,353) | (7,103)
Other comprehensive income (loss) before reclassification | 74 | 99
Amounts reclassified from accumulated other comprehensive income | (19) | 0
Tax expense (benefit) | 0 | (25)
Other comprehensive (loss) income, net of tax | 55 | 74
Ending balance | $ (6,298) | $ (7,029)

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