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Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Deferred Tax Assets |  |
Unrealized losses on available-for-sale investment securities | $ 217,018 | $ 202,101
Allowance for credit losses on loans, net of recapture | 86,224 | 85,619
Operating lease liabilities | 57,996 | 58,288
Unrealized losses on held-to-maturity investment securities | 32,150 | 36,197
Acquired loans | 32,011 | 40,723
Benefit plan accruals | 31,679 | 38,038
Purchase accounting | 22,473 | 20,063
Net operating loss carryforwards | 21,004 | 25,135
FDIC deductible premiums | 4,891 | 0
Unrealized losses on hedges | 0 | 10,277
Other, net | 4,860 | 4,962
Total deferred tax assets | 510,306 | 521,403
Deferred Tax Liabilities |  |
Operating lease right-of-use assets | (52,710) | (51,845)
Premises and equipment | (12,141) | (14,844)
Loan servicing rights | (9,188) | (9,636)
Prepaid expenses | (3,856) | (2,774)
Unrealized gains on hedges | (3,202) | 0
Deferred loan origination fees | (2,361) | (3,566)
Other, net | (3,588) | (2,983)
Total deferred tax liabilities | (87,046) | (85,648)
Net deferred tax assets | $ 423,260 | $ 435,755

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