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Income Taxes - Summary of Net Deferred Tax Asset Reported in Other Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Provision for credit losses | $ 22,500 | $ 13,763
Write-downs of other real estate owned | 143 | 181
Deferred compensation | 2,325 | 2,268
Stock-based compensation | 1,672 | 1,514
Investments in partnership interests | 4,695 | 3,677
Other | 405 | 903
Gross deferred tax assets | 31,740 | 22,306
Unrealized net gains on securities | (2,513) | (1,187)
Premium on securities of banks acquired | (144) | (153)
Intangibles | (6,135) | (6,757)
Basis difference related to tax credits | (2,127) | (2,015)
Depreciation | (11,529) | (10,349)
Prepaid expense deducted | (1,208) | (1,000)
Other | (178) | (180)
Gross deferred tax liabilities | (23,834) | (21,641)
Net deferred tax asset | $ 7,906 | $ 665

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