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Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Deferred Tax Assets |  |
Allowance for credit losses on loans, net of recapture | $ 85,619 | $ 28,843
Benefit plan accruals | 38,038 | 18,348
Net operating loss carryforwards | 25,135 | 14,823
Acquired loans | 40,723 | 8,039
Operating lease liabilities | 58,288 | 22,961
Unrealized losses on available-for-sale investment securities | 202,101 | 3,003
Unrealized losses on held-to-maturity investment securities | 36,197 | 0
Unrealized losses on hedges | 10,277 | 0
Purchase accounting | 20,063 | 0
Other, net | 4,962 | 3,430
Total deferred tax assets | 521,403 | 99,447
Deferred Tax Liabilities |  |
Deferred loan origination fees | (3,566) | 0
Purchase accounting | 0 | (18,524)
Loan servicing rights | (9,636) | (7,379)
Premises and equipment | (14,844) | (16,972)
Prepaid expenses | (2,774) | (796)
Operating lease right-of-use assets | (51,845) | (21,129)
Unrealized gains on hedges | 0 | (177)
Other, net | (2,983) | (1,564)
Total deferred tax liabilities | (85,648) | (66,541)
Net deferred tax assets | $ 435,755 | $ 32,906

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