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Income Taxes - Tax Effects of Temporary Differences Related to Deferred Taxes Included in Other Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Deferred tax assets: |  |
Loans acquired | $ 5,882 | $ 10,100
Allowance for credit losses | 47,652 | 58,028
Valuation of foreclosed assets | 1,631 | 1,673
Tax NOLs from acquisition | 13,698 | 16,028
Deferred compensation payable | 3,342 | 3,060
Accrued equity and other compensation | 6,091 | 5,905
Acquired securities | 431 | 587
Right-of-use lease liability | 9,992 | 7,835
Unrealized loss on AFS securities | 3,631 | 0
Allowance for unfunded commitments | 5,444 | 5,583
Other | 8,255 | 7,600
Gross deferred tax assets | 106,049 | 116,399
Deferred tax liabilities: |  |
Goodwill and other intangible amortization | (36,584) | (38,882)
Accumulated depreciation | (24,510) | (34,667)
Right-of-use lease asset | (9,893) | (7,813)
Unrealized gain on available-for-sale securities | 0 | (17,521)
Other | (4,001) | (4,021)
Gross deferred tax liabilities | (74,988) | (102,904)
Net deferred tax asset | $ 31,061 | $ 13,495

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