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Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Deferred Tax Assets |  |
Allowance for credit losses, net of recapture | $ 75,316 | $ 28,843
Benefit plan accruals | 11,781 | 18,348
Net operating loss carryforwards | 46,649 | 14,823
Deferred gain on securities | 991 | 1,215
Acquired loans | 41,387 | 8,039
Operating lease liabilities | 64,227 | 22,961
Unrealized losses on available-for-sale investment securities | 99,240 | 3,003
Unrealized losses on held-to-maturity investment securities | 5,126 | 0
Deferred Tax Assets Unrealized Losses Hedges | 2,323 | 0
Tax credit investments and other partnerships | 441 | 301
Purchase accounting | 11,414 | 0
Other, net | 3,424 | 1,914
Total deferred tax assets | 362,319 | 99,447
Deferred Tax Liabilities |  |
Purchase accounting | 0 | (18,524)
Loan servicing rights | (9,799) | (7,379)
Premises and equipment | (14,254) | (16,972)
Prepaid expenses | (835) | (796)
Operating lease right-of-use assets | (55,749) | (21,129)
Deferred loan origination fees | (5,423) | 0
Unrealized gains on hedges | 0 | (177)
Other, net | (2,480) | (1,564)
Total deferred tax liabilities | (88,540) | (66,541)
Net deferred tax assets | $ 273,779 | $ 32,906

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