Note 3 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available For Sale
Available for Sale Securities - Amortized Cost	$ 577,248	$ 618,429
Available for Sale Securities - Gross Unrealized Gains	8,186	10,963
Available for Sale Securities - Gross Unrealized Losses	3,232	3,004
Available for Sale Securities - Estimated Fair Value	582,202	626,388
Held To Maturity
Held to Maturity Securities - Amortized Cost	3,611	3,728
Held to Maturity Securities - Estimated Fair Value	3,809	3,923
US Government-sponsored Enterprises Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	107,135	110,094
Available for Sale Securities - Gross Unrealized Gains	309	369
Available for Sale Securities - Gross Unrealized Losses	538	1,015
Available for Sale Securities - Estimated Fair Value	106,906	109,448
US States and Political Subdivisions Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	147,875	133,563
Available for Sale Securities - Gross Unrealized Gains	2,604	2,600
Available for Sale Securities - Gross Unrealized Losses	213	397
Available for Sale Securities - Estimated Fair Value	150,266	135,766
Held To Maturity
Held to Maturity Securities - Amortized Cost	3,611	3,728
Held to Maturity Securities - Gross Unrealized Gains	198	195
Held to Maturity Securities - Gross Unrealized Losses	0	0
Held to Maturity Securities - Estimated Fair Value	3,809	3,923
Residential Mortgage Backed Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	294,140	363,729
Available for Sale Securities - Gross Unrealized Gains	5,210	7,959
Available for Sale Securities - Gross Unrealized Losses	1,489	1,199
Available for Sale Securities - Estimated Fair Value	297,861	370,489
Commercial Mortgage Backed Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	20,655	2,515
Available for Sale Securities - Gross Unrealized Gains	52	7
Available for Sale Securities - Gross Unrealized Losses	123	10
Available for Sale Securities - Estimated Fair Value	20,584	2,512
Corporate Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	6,629	6,639
Available for Sale Securities - Gross Unrealized Gains	11	26
Available for Sale Securities - Gross Unrealized Losses	800	358
Available for Sale Securities - Estimated Fair Value	5,840	6,307
Mutual Funds and Equity Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	814	1,889
Available for Sale Securities - Gross Unrealized Gains	0	2
Available for Sale Securities - Gross Unrealized Losses	69	25
Available for Sale Securities - Estimated Fair Value	$ 745	$ 1,866

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

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-Name Accounting Standards Codification
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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