Loans - Schedule of Loan Portfolio Excluding Loans Held for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 673,586	$ 622,790	$ 563,975
Mortgage Loans on Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	497,452	454,304
Mortgage Loans on Real Estate | Construction and development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	70,927	71,350	60,333
Mortgage Loans on Real Estate | 1-4 Family residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	153,118	137,519	125,246
Mortgage Loans on Real Estate | Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	21,260	17,458	17,706
Mortgage Loans on Real Estate | Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,001	2,919	2,282
Mortgage Loans on Real Estate | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	249,146	225,058	191,820
Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	56,485	54,187	34,778
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 119,649	$ 114,299	$ 131,810