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Federal and State Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets    
Allowance for credit losses $ 49,375 $ 44,040
Operating lease liabilities 12,103 12,551
Employee benefits 10,868 9,309
Deferred compensation 8,002 7,638
Acquisition fair market value adjustments 6,891 4,398
Net operating loss carryforwards 1,569 1,884
Available-for-sale debt securities 1,156 0
Other 2,787 2,262
Total gross deferred tax assets 92,751 82,082
Deferred tax liabilities    
Depreciation of premises and equipment (15,749) (14,654)
Operating lease ROU assets (11,293) (11,830)
Transferred debt securities (10,299) 0
Intangibles (9,760) (14,671)
Deferred loan costs (9,264) (8,940)
Mortgage servicing rights (3,244) (2,268)
Available-for-sale debt securities 0 (48,505)
Other (5,449) (5,074)
Total gross deferred tax liabilities (65,058) (105,942)
Net deferred tax asset (liability) $ 27,693  
Net deferred tax asset (liability)   $ (23,860)