Note 2 - Securities (Details) - Gross Unrealized Losses And Fair Value Of Securities Available For Sale Gross Of OTTI (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Securities available-for-sale
Less Than 12 Months Fair Value	$ 142,271	$ 9,921
Less Than 12 Months Gross Unrealized Losses	(5,813)	(73)
Greater Than 12 Months Fair Value	0	72
Greater Than 12 Months Gross Unrealized Losses	0	0
Total Fair Value	142,271	9,993
Total Gross Unrealized Losses	(5,813)	(73)
US Treasury and Government [Member]
Securities available-for-sale
Less Than 12 Months Fair Value	82,617	9,921
Less Than 12 Months Gross Unrealized Losses	(3,773)	(73)
Greater Than 12 Months Fair Value	0	0
Greater Than 12 Months Gross Unrealized Losses	0	0
Total Fair Value	82,617	9,921
Total Gross Unrealized Losses	(3,773)	(73)
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale
Less Than 12 Months Fair Value	14,289
Less Than 12 Months Gross Unrealized Losses	(844)
Greater Than 12 Months Fair Value	0
Greater Than 12 Months Gross Unrealized Losses	0
Total Fair Value	14,289
Total Gross Unrealized Losses	(844)
US Government Agencies Debt Securities [Member]
Securities available-for-sale
Less Than 12 Months Fair Value	31,360
Less Than 12 Months Gross Unrealized Losses	(859)
Greater Than 12 Months Fair Value	0
Greater Than 12 Months Gross Unrealized Losses	0
Total Fair Value	31,360
Total Gross Unrealized Losses	(859)
Asset-backed Securities [Member]
Securities available-for-sale
Less Than 12 Months Fair Value	64
Less Than 12 Months Gross Unrealized Losses	(1)
Total Fair Value	64
Total Gross Unrealized Losses	(1)
CRA Funds [Member]
Securities available-for-sale
Less Than 12 Months Fair Value	13,941
Less Than 12 Months Gross Unrealized Losses	(336)
Total Fair Value	13,941
Total Gross Unrealized Losses	(336)
Residential Mortgage Backed Securities [Member]
Securities available-for-sale
Less Than 12 Months Fair Value		0
Less Than 12 Months Gross Unrealized Losses		0
Greater Than 12 Months Fair Value		72
Greater Than 12 Months Gross Unrealized Losses		0
Total Fair Value		72
Total Gross Unrealized Losses		$ 0