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Note 4 - Investment Securities Available-for-sale - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Amortized cost	$ 541,364	$ 486,134
Gross unrealized gains	2,648	5,327
Gross unrealized losses	5,904	3,592
Available-for-sale Securities	538,108	487,869
US Government Agencies Debt Securities [Member]
Amortized cost	107,425	56,775
Gross unrealized gains	519	477
Gross unrealized losses	1,802	277
Available-for-sale Securities	106,142	56,975
Residential Mortgage Backed Securities [Member]
Amortized cost	329,606	299,709
Gross unrealized gains	324	692
Gross unrealized losses	3,691	3,160
Available-for-sale Securities	326,239	297,241
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	94,607	114,253
Gross unrealized gains	1,723	4,131
Gross unrealized losses	400	3
Available-for-sale Securities	95,930	118,381
Corporate Debt Securities [Member]
Amortized cost	9,508	15,090
Gross unrealized gains	82
Gross unrealized losses	11	152
Available-for-sale Securities	9,579	14,938
Equity Investment Other [Member]
Amortized cost	218	307
Gross unrealized gains		27
Gross unrealized losses
Available-for-sale Securities	$ 218	$ 334

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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