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Credit Quality - Additional information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Covered Loans	Dec. 31, 2013 Covered Loans	Sep. 30, 2014 PCI loans Loan	Dec. 31, 2013 PCI loans Loan	Sep. 30, 2013 PCI loans Loan	Sep. 30, 2014 Waccamaw Bank	Jun. 30, 2014 Waccamaw Bank
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of impaired loans								1	4	4
Number of loans								7
Minimum commercial loan relationships to be reviewed by loan review function	$ 4,000,000		$ 4,000,000
Percentage of loan and foreclosed real estate losses covered by FDIC											80.00%	80.00%
Amount of non-covered loans decreased											15,230,000
Percentage of non-covered loans decreased											13.56%
Amount of covered loans decreased											16,220,000
Percentage of covered loans decreased											19.06%
Accruing loans contractually past due 90 days or more						0	86,000
Restructured loans to borrowers experiencing financial difficulty in excess of	250,000		250,000
Performing status returned period			6 months
Allowance for loan losses	653,000		653,000		1,840,000
Interest income recognized on loan restructurings	$ 188,000	$ 183,000	$ 466,000	$ 422,000