Note 6 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Note 6 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Investment Securities - Amortized Cost	$ 638,266	$ 618,429
Available for Sale Investment Securities - Gross Unrealized Gains	12,644	10,963
Available for Sale Investment Securities - Gross Unrealized Losses	1,872	3,004
Available for Sale Investment Securities	649,038us-gaap_AvailableForSaleSecurities	626,388us-gaap_AvailableForSaleSecurities
Held to Maturity Securities - Amortized Cost	3,715us-gaap_HeldToMaturitySecurities	3,728us-gaap_HeldToMaturitySecurities
Held to Maturity Securities - Estimated Fair Value	3,905	3,923
US Government-sponsored Enterprises Debt Securities [Member]
Note 6 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Investment Securities - Amortized Cost	135,491	110,094
Available for Sale Investment Securities - Gross Unrealized Gains	539	369
Available for Sale Investment Securities - Gross Unrealized Losses	367	1,015
Available for Sale Investment Securities	135,663	109,448
US States and Political Subdivisions Debt Securities [Member]
Note 6 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Investment Securities - Amortized Cost	139,835	133,563
Available for Sale Investment Securities - Gross Unrealized Gains	2,944	2,600
Available for Sale Investment Securities - Gross Unrealized Losses	282	397
Available for Sale Investment Securities	142,497	135,766
Held to Maturity Securities - Amortized Cost	3,715	3,728
Held to Maturity Securities - Gross Unrealized Gains	190	195
Held to Maturity Securities - Gross Unrealized Losses	0	0
Held to Maturity Securities - Estimated Fair Value	3,905	3,923
Residential Mortgage Backed Securities [Member]
Note 6 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Investment Securities - Amortized Cost	343,541	363,729
Available for Sale Investment Securities - Gross Unrealized Gains	8,993	7,959
Available for Sale Investment Securities - Gross Unrealized Losses	620	1,199
Available for Sale Investment Securities	351,914	370,489
Commercial Mortgage Backed Securities [Member]
Note 6 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Investment Securities - Amortized Cost	11,669	2,515
Available for Sale Investment Securities - Gross Unrealized Gains	138	7
Available for Sale Investment Securities - Gross Unrealized Losses	0	10
Available for Sale Investment Securities	11,807	2,512
Corporate Debt Securities [Member]
Note 6 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Investment Securities - Amortized Cost	6,881	6,639
Available for Sale Investment Securities - Gross Unrealized Gains	26	26
Available for Sale Investment Securities - Gross Unrealized Losses	526	358
Available for Sale Investment Securities	6,381	6,307
Mutual Funds and Equity Securities [Member]
Note 6 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Investment Securities - Amortized Cost	849	1,889
Available for Sale Investment Securities - Gross Unrealized Gains	4	2
Available for Sale Investment Securities - Gross Unrealized Losses	77	25
Available for Sale Investment Securities	$ 776	$ 1,866

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