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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