Note 6 - Investment Securities - The Amortized Costs and Estimated Fair Value of the Securities Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Available for Sale Securities - Amortized Cost	$ 465,281	$ 486,038
Available for Sale Securities - Gross Unrealized Gains	2,772	2,518
Available for Sale Securities - Gross Unrealized Losses	4,433	7,692
Available for Sale Securities - Estimated Fair Value	463,620	480,864
Held to Maturity Securities - Amortized Cost	3,461	3,488
Held to Maturity Securities - Estimated Fair Value	3,617	3,597
US Government-sponsored Enterprises Debt Securities [Member]
Available for Sale Securities - Amortized Cost	79,734	71,941
Available for Sale Securities - Gross Unrealized Gains	160	213
Available for Sale Securities - Gross Unrealized Losses	377	460
Available for Sale Securities - Estimated Fair Value	79,517	71,694
US States and Political Subdivisions Debt Securities [Member]
Available for Sale Securities - Amortized Cost	126,308	134,055
Available for Sale Securities - Gross Unrealized Gains	1,128	773
Available for Sale Securities - Gross Unrealized Losses	863	2,536
Available for Sale Securities - Estimated Fair Value	126,573	132,292
Held to Maturity Securities - Amortized Cost	3,461	3,488
Held to Maturity Securities - Gross Unrealized Gains	156	109
Held to Maturity Securities - Gross Unrealized Losses	0	0
Held to Maturity Securities - Estimated Fair Value	3,617	3,597
Residential Mortgage Backed Securities [Member]
Available for Sale Securities - Amortized Cost	202,825	225,489
Available for Sale Securities - Gross Unrealized Gains	1,339	1,505
Available for Sale Securities - Gross Unrealized Losses	2,001	2,687
Available for Sale Securities - Estimated Fair Value	202,163	224,307
Commercial Mortgage Backed Securities [Member]
Available for Sale Securities - Amortized Cost	48,003	47,164
Available for Sale Securities - Gross Unrealized Gains	9	6
Available for Sale Securities - Gross Unrealized Losses	1,186	1,557
Available for Sale Securities - Estimated Fair Value	46,826	45,613
Corporate Debt Securities [Member]
Available for Sale Securities - Amortized Cost	7,575	6,565
Available for Sale Securities - Gross Unrealized Gains	94	1
Available for Sale Securities - Gross Unrealized Losses	3	441
Available for Sale Securities - Estimated Fair Value	7,666	6,125
Mutual Funds and Equity Securities [Member]
Available for Sale Securities - Amortized Cost	836	824
Available for Sale Securities - Gross Unrealized Gains	42	20
Available for Sale Securities - Gross Unrealized Losses	3	11
Available for Sale Securities - Estimated Fair Value	$ 875	$ 833

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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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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