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Note 3 - Investment Securities Available-for-sale - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
US Government Agencies Debt Securities [Member]
Amortized cost	$ 54,948	$ 56,775
Gross unrealized gains	774	477
Gross unrealized losses	100	277
Estimated fair value	55,622	56,975
Residential Mortgage Backed Securities [Member]
Amortized cost	305,351	299,709
Gross unrealized gains	2,073	692
Gross unrealized losses	612	3,160
Estimated fair value	306,812	297,241
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	104,840	114,253
Gross unrealized gains	$ 5,069	4,131
Gross unrealized losses		3
Estimated fair value	$ 109,909	118,381
Corporate Debt Securities [Member]
Amortized cost	$ 15,085	$ 15,090
Gross unrealized gains
Gross unrealized losses	$ 147	$ 152
Estimated fair value	14,938	14,938
Equity Investment Other [Member]
Amortized cost	310	307
Gross unrealized gains	$ 18	$ 27
Gross unrealized losses
Estimated fair value	$ 328	$ 334
Amortized cost	480,534	486,134
Gross unrealized gains	7,934	5,327
Gross unrealized losses	859	3,592
Estimated fair value	$ 487,609	$ 487,869	$ 333,531

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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Balance Type:	debit
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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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Period Type:	instant

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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