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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Income Taxes [Line Items]
Federal income tax rate										35.00%	35.00%	35.00%
State net operating loss carryforward	$ 9,700				$ 1,200					$ 9,700	$ 1,200
State net operating loss carryforwards expiration period										2030
Deferred tax asset for the allowance for credit losses	5,000									$ 5,000
Deferred tax assets, state taxes	300				32					300	32
Income tax expense	923	$ 3,235	$ 3,751	$ 2,385	$ 4,014	$ 4,020	$ 3,668	$ 3,215		10,294	14,917	$ 14,774
Tax benefit										1,600	$ 0	$ 0
Provisional benefit to income tax expense, Tax Act	$ 3,100									$ 3,122
Tax Year 2013 [Member] | Tennessee [Member]
Schedule Of Income Taxes [Line Items]
Open tax year										2013
Tax Year 2013 [Member] | South Carolina [Member]
Schedule Of Income Taxes [Line Items]
Open tax year										2013
Earliest Tax Year [Member] | Texas [Member]
Schedule Of Income Taxes [Line Items]
Open tax year										2011
Scenario, Forecast [Member]
Schedule Of Income Taxes [Line Items]
Federal income tax rate									21.00%

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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