Note 3 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Note 3 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Securities - Amortized Cost	$ 618,429	$ 618,395
Available for Sale Securities - Gross Unrealized Gains	10,963	7,337
Available for Sale Securities - Gross Unrealized Losses	3,004	12,912
Available for Sale Securities - Estimated Fair Value	626,388us-gaap_AvailableForSaleSecurities	612,820us-gaap_AvailableForSaleSecurities
Held to Maturity Securities - Amortized Cost	3,728us-gaap_HeldToMaturitySecurities	765us-gaap_HeldToMaturitySecurities
Held to Maturity Securities - Estimated Fair Value	3,923	827
US Government-sponsored Enterprises Debt Securities [Member]
Note 3 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Securities - Amortized Cost	110,094	96,750
Available for Sale Securities - Gross Unrealized Gains	369	155
Available for Sale Securities - Gross Unrealized Losses	1,015	3,155
Available for Sale Securities - Estimated Fair Value	109,448	93,750
US States and Political Subdivisions Debt Securities [Member]
Note 3 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Securities - Amortized Cost	133,563	132,311
Available for Sale Securities - Gross Unrealized Gains	2,600	2,056
Available for Sale Securities - Gross Unrealized Losses	397	2,397
Available for Sale Securities - Estimated Fair Value	135,766	131,970
Held to Maturity Securities - Amortized Cost	3,728	765
Held to Maturity Securities - Gross Unrealized Gains	195	62
Held to Maturity Securities - Gross Unrealized Losses	0	0
Held to Maturity Securities - Estimated Fair Value	3,923	827
Residential Mortgage Backed Securities [Member]
Note 3 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Securities - Amortized Cost	363,729	379,238
Available for Sale Securities - Gross Unrealized Gains	7,959	5,071
Available for Sale Securities - Gross Unrealized Losses	1,199	6,232
Available for Sale Securities - Estimated Fair Value	370,489	378,077
Commercial Mortgage Backed Securities [Member]
Note 3 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Securities - Amortized Cost	2,515	748
Available for Sale Securities - Gross Unrealized Gains	7	0
Available for Sale Securities - Gross Unrealized Losses	10	59
Available for Sale Securities - Estimated Fair Value	2,512	689
Corporate Debt Securities [Member]
Note 3 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Securities - Amortized Cost	6,639	7,266
Available for Sale Securities - Gross Unrealized Gains	26	40
Available for Sale Securities - Gross Unrealized Losses	358	1,049
Available for Sale Securities - Estimated Fair Value	6,307	6,257
Mutual Funds and Equity Securities [Member]
Note 3 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio [Line Items]
Available for Sale Securities - Amortized Cost	1,889	2,082
Available for Sale Securities - Gross Unrealized Gains	2	15
Available for Sale Securities - Gross Unrealized Losses	25	20
Available for Sale Securities - Estimated Fair Value	$ 1,866	$ 2,077

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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