Note 7 - Fair Value of Assets and Liabilities (Detail) - Level 3 Fair Value Measurements for Non-recurring (Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Unobservable Inputs (Member) | Impaired Loans (Member)
Unobservable Inputs	Discount to reflect current market conditions and estimated selling costs
Unobservable Inputs (Member) | OREO (Member)
Unobservable Inputs	Discount to reflect current market conditions and estimated selling costs
Valuation Technique (Member) | Impaired Loans (Member)
Valuation Technique(s)	Appraisals
Valuation Technique (Member) | OREO (Member)
Valuation Technique(s)	Appraisals
Minimum [Member] | Impaired Loans (Member)
Minimum Range of Inputs	5.00%
Minimum [Member] | OREO (Member)
Minimum Range of Inputs	0.00%
Maximum [Member] | Impaired Loans (Member)
Maximum Range of Inputs	40.00%
Maximum [Member] | OREO (Member)
Maximum Range of Inputs	70.00%
Impaired Loans (Member)
Fair Value (in Dollars)	2,617
OREO (Member)
Fair Value (in Dollars)	5,297