Note 6 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available For Sale
Available for Sale Securities - Amortized Cost	$ 577,678	$ 577,248
Available for Sale Securities - Gross Unrealized Gains	10,745	8,186
Available for Sale Securities - Gross Unrealized Losses	1,741	3,232
Available for Sale Securities - Estimated Fair Value	586,682	582,202
Held To Maturity
Held to Maturity Securities - Amortized Cost	3,598	3,611
Held to Maturity Securities - Estimated Fair Value	3,826	3,809
US Government-sponsored Enterprises Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	121,411	107,135
Available for Sale Securities - Gross Unrealized Gains	751	309
Available for Sale Securities - Gross Unrealized Losses	11	538
Available for Sale Securities - Estimated Fair Value	122,151	106,906
US States and Political Subdivisions Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	126,300	147,875
Available for Sale Securities - Gross Unrealized Gains	2,783	2,604
Available for Sale Securities - Gross Unrealized Losses	117	213
Available for Sale Securities - Estimated Fair Value	128,966	150,266
Held To Maturity
Held to Maturity Securities - Amortized Cost	3,598	3,611
Held to Maturity Securities - Gross Unrealized Gains	228	198
Held to Maturity Securities - Gross Unrealized Losses	0	0
Held to Maturity Securities - Estimated Fair Value	3,826	3,809
Residential Mortgage Backed Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	300,220	294,140
Available for Sale Securities - Gross Unrealized Gains	6,946	5,210
Available for Sale Securities - Gross Unrealized Losses	208	1,489
Available for Sale Securities - Estimated Fair Value	306,958	297,861
Commercial Mortgage Backed Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	21,467	20,655
Available for Sale Securities - Gross Unrealized Gains	249	52
Available for Sale Securities - Gross Unrealized Losses	6	123
Available for Sale Securities - Estimated Fair Value	21,710	20,584
Corporate Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	7,363	6,629
Available for Sale Securities - Gross Unrealized Gains	16	11
Available for Sale Securities - Gross Unrealized Losses	1,352	800
Available for Sale Securities - Estimated Fair Value	6,027	5,840
Mutual Funds and Equity Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	917	814
Available for Sale Securities - Gross Unrealized Gains	0	0
Available for Sale Securities - Gross Unrealized Losses	47	69
Available for Sale Securities - Estimated Fair Value	$ 870	$ 745

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

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-Publisher FASB
-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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