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Income Taxes - Summary of Net Deferred Tax Asset Reported in Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provision for loan losses	$ 13,089	$ 13,123
Unrealized net losses on securities	731	739
Write-downs of other real estate owned	462	473
Deferred compensation	2,209	2,113
Stock-based compensation	1,448	1,351
Investments in partnership interests	4,274	3,758
Other	963	275
Gross deferred tax assets	23,176	21,832
Premium on securities of banks acquired	(185)	(219)
Intangibles	(5,376)	(3,359)
Basis difference related to tax credits	(2,560)	(2,713)
Depreciation	(8,484)	(4,563)
Leveraged lease		(821)
Prepaid expense deducted	(1,178)	(887)
Other	(181)	(180)
Gross deferred tax liabilities	(17,964)	(12,742)
Net deferred tax asset	$ 5,212	$ 9,090

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