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Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Deferred Tax Assets |  |
Unrealized losses on available-for-sale investment securities | $ 222,467 | $ 217,018
Allowance for credit losses on loans, net of recapture | 105,475 | 86,224
Operating lease liabilities | 57,495 | 57,996
Acquired loans | 49,093 | 32,011
Benefit plan accruals | 40,089 | 31,679
Unrealized losses on held-to-maturity investment securities | 27,664 | 32,150
Net operating loss carryforwards | 19,601 | 21,004
Purchase accounting | 10,062 | 22,473
FDIC deductible premiums | 3,766 | 4,891
Other, net | 6,658 | 4,860
Total deferred tax assets | 542,370 | 510,306
Deferred Tax Liabilities |  |
Operating lease right-of-use assets | (52,441) | (52,710)
Premises and equipment | (13,358) | (12,141)
Loan servicing rights | (10,012) | (9,188)
Prepaid expenses | (3,982) | (3,856)
Tax credit investments and other partnerships | (2,310) | (785)
Unrealized gains on hedges | (1,505) | (3,202)
Deferred loan origination fees | 0 | (2,361)
Other, net | (2,315) | (2,803)
Total deferred tax liabilities | (85,923) | (87,046)
Net deferred tax assets | $ 456,447 | $ 423,260

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