Note 3 - Investment Securities - The Amortized Costs and Estimated Fair Value of the Securities Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available for Sale Securities - Amortized Cost	$ 486,038	$ 577,248
Available for Sale Securities - Gross Unrealized Gains	2,518	8,186
Available for Sale Securities - Gross Unrealized Losses	7,692	3,232
Available-for-sale Securities	480,864	582,202
Held to Maturity Securities - Amortized Cost	3,488	3,611
Held to Maturity Securities - Estimated Fair Value	3,597	3,809
US Government-sponsored Enterprises Debt Securities [Member]
Available for Sale Securities - Amortized Cost	71,941	107,135
Available for Sale Securities - Gross Unrealized Gains	213	309
Available for Sale Securities - Gross Unrealized Losses	460	538
Available-for-sale Securities	71,694	106,906
US States and Political Subdivisions Debt Securities [Member]
Available for Sale Securities - Amortized Cost	134,055	147,875
Available for Sale Securities - Gross Unrealized Gains	773	2,604
Available for Sale Securities - Gross Unrealized Losses	2,536	213
Available-for-sale Securities	132,292	150,266
Held to Maturity Securities - Amortized Cost	3,488	3,611
Held to Maturity Securities - Gross Unrealized Gains	109	198
Held to Maturity Securities - Gross Unrealized Losses	0	0
Held to Maturity Securities - Estimated Fair Value	3,597	3,809
Residential Mortgage Backed Securities [Member]
Available for Sale Securities - Amortized Cost	225,489	294,140
Available for Sale Securities - Gross Unrealized Gains	1,505	5,210
Available for Sale Securities - Gross Unrealized Losses	2,687	1,489
Available-for-sale Securities	224,307	297,861
Commercial Mortgage Backed Securities [Member]
Available for Sale Securities - Amortized Cost	47,164	20,655
Available for Sale Securities - Gross Unrealized Gains	6	52
Available for Sale Securities - Gross Unrealized Losses	1,557	123
Available-for-sale Securities	45,613	20,584
Corporate Debt Securities [Member]
Available for Sale Securities - Amortized Cost	6,565	6,629
Available for Sale Securities - Gross Unrealized Gains	1	11
Available for Sale Securities - Gross Unrealized Losses	441	800
Available-for-sale Securities	6,125	5,840
Mutual Funds and Equity Securities [Member]
Available for Sale Securities - Amortized Cost	824	814
Available for Sale Securities - Gross Unrealized Gains	20
Available for Sale Securities - Gross Unrealized Losses	11	69
Available-for-sale Securities	$ 833	$ 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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