Note 6 - FDIC For Loss Share Agreements (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$ 91,936,000	$ 101,753,000
Other Real Estate, Covered	7,654,000	6,646,000
FDIC Indemnification Asset	15,340,000	18,697,000
FDIC Indemnification Asset, Cash Payments Received	3,415,000
FDIC Indemnification Asset True Up Amount	5,000,000	4,900,000
Citizens South Banking Corporation [Member] | Covered Real Estate [Member]
Other Real Estate, Covered	7,700,000
Citizens South Banking Corporation [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	91,900,000
Other Real Estate, Covered		6,700,000
FDIC Indemnification Asset	6,000,000
Bank of Hiawassee Acquired Through Citizens South [Member]
FDIC Indemnification Asset	9,300,000
Maximum Amount Covered By FDIC	102,000,000
Covered Assets [Member]
Loss Contingency, Estimate of Possible Loss	$ 15,900,000	$ 19,600,000