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Income Taxes - Summary of Net Deferred Tax Asset Reported in Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Provision for loan losses	$ 13,763	$ 13,089
Unrealized net losses on securities		731
Write-downs of other real estate owned	181	462
Deferred compensation	2,268	2,209
Stock-based compensation	1,514	1,448
Investments in partnership interests	3,677	4,274
Other	903	963
Gross deferred tax assets	22,306	23,176
Unrealized net gains on securities	(1,187)
Premium on securities of banks acquired	(153)	(185)
Intangibles	(6,757)	(5,376)
Basis difference related to tax credits	(2,015)	(2,560)
Depreciation	(10,349)	(8,484)
Prepaid expense deducted	(1,000)	(1,178)
Other	(180)	(181)
Gross deferred tax liabilities	(21,641)	(17,964)
Net deferred tax asset	$ 665	$ 5,212

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