Note 5 - Securities (Details) - Held to Maturity Securities (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Held to Maturity:
Amortized Costs	$ 166,915	$ 160,539
Gross Unrealized Gains	3,890	10,523
Gross Unrealized Losses	6,921	216
Fair Values	163,884	170,846
US Government Agencies [Member]
Held to Maturity:
Amortized Costs	13,980	7,988
Gross Unrealized Gains	336	563
Gross Unrealized Losses	651	0
Fair Values	13,665	8,551
Mortgage-backed Securities [Member]
Held to Maturity:
Amortized Costs	586	691
Gross Unrealized Gains	62	73
Gross Unrealized Losses	0	0
Fair Values	648	764
States and Political Subdivisions [Member]
Held to Maturity:
Amortized Costs	152,349	151,209
Gross Unrealized Gains	3,492	9,880
Gross Unrealized Losses	6,270	216
Fair Values	149,571	160,873
Corporate Securities [Member]
Held to Maturity:
Amortized Costs		651
Gross Unrealized Gains		7
Gross Unrealized Losses		0
Fair Values		$ 658