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Credit Quality - Additional information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Minimum commercial loan relationships to be reviewed by loan review function	$ 4,000,000		$ 4,000,000
Restructured loans to borrowers experiencing financial difficulty in excess of	250,000		250,000
Performing status returned period			6 months
Allowance for loan losses	1,770,000		1,770,000		1,840,000
Interest income recognized on loan restructurings	129,000	68,000	278,000	217,000
Covered Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing loans contractually past due 90 days or more	109,000		109,000		86,000
PCI loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of impaired loans	4	1	4	1	4
Number of loans	7		7
Waccamaw Bank
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of loan and foreclosed real estate losses covered by FDIC	80.00%		80.00%
Amount of non-covered loans decreased	5,400,000		5,400,000
Percentage of non-covered loans decreased	7.71%		7.71%
Amount of covered loans decreased	$ 10,440,000		$ 10,440,000
Percentage of covered loans decreased	32.31%		32.31%