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Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred Tax Assets |  |
Allowance for credit losses, net of recapture | $ 30,374 | $ 34,971
Benefit plan accruals | 11,136 | 20,076
Net operating loss carryforwards | 15,553 | 18,982
Federal tax credits | 1,332 | 0
Deferred gain on securities | 1,786 | 2,102
Acquired loans | 10,912 | 11,989
Operating lease liabilities | 23,710 | 24,245
Tax credit investments and other partnerships | 968 | 1,054
Other real estate owned | 6 | 28
Other, net | 720 | 460
Total deferred tax assets | 96,497 | 113,907
Deferred Tax Liabilities |  |
Purchase accounting | (18,365) | (18,232)
Loan servicing rights | (6,928) | (6,582)
Premises and equipment | (13,972) | (14,008)
Prepaid expenses | (956) | (955)
Operating lease right-of-use assets | (21,105) | (21,569)
Unrealized gains on available-for-sale investment securities | (24,327) | (40,756)
Unrealized gains on hedges | (1,800) | (1,080)
Other, net | (1,557) | (1,555)
Total deferred tax liabilities | (89,010) | (104,737)
Net deferred tax assets | $ 7,487 | $ 9,170

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