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Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Assets    
Allowance for credit losses, net of recapture $ 28,843 $ 34,971
Benefit plan accruals 18,348 20,076
Net operating loss carryforwards 14,823 18,982
Deferred gain on securities 1,215 2,102
Acquired loans 8,039 11,989
Operating lease liabilities 22,961 24,245
Unrealized losses on available-for-sale investment securities 3,003 0
Tax credit investments and other partnerships 301 1,054
Other, net 1,914 488
Total deferred tax assets 99,447 113,907
Deferred Tax Liabilities    
Purchase accounting (18,524) (18,232)
Loan servicing rights (7,379) (6,582)
Premises and equipment (16,972) (14,008)
Prepaid expenses (796) (955)
Operating lease right-of-use assets (21,129) (21,569)
Unrealized gains on available-for-sale investment securities 0 (40,756)
Unrealized gains on hedges (177) (1,080)
Other, net (1,564) (1,555)
Total deferred tax liabilities (66,541) (104,737)
Net deferred tax assets $ 32,906 $ 9,170