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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)

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