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Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items]
Amortized Cost	$ 486,134	$ 377,933
Gross Unrealized gains	5,327	7,087
Gross unrealized losses	3,592	2,677
Estimated Fair Value	487,869	382,343
US Government Agencies Debt Securities [Member]
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items]
Amortized Cost	56,775	29,434
Gross Unrealized gains	477	500
Gross unrealized losses	277	40
Estimated Fair Value	56,975	29,894
Residential Mortgage Backed Securities [Member]
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items]
Amortized Cost	299,709	241,120
Gross Unrealized gains	692	1,716
Gross unrealized losses	3,160	2,516
Estimated Fair Value	297,241	240,320
US States and Political Subdivisions Debt Securities [Member]
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items]
Amortized Cost	114,253	106,983
Gross Unrealized gains	4,131	4,850
Gross unrealized losses	3	121
Estimated Fair Value	118,381	111,712
Corporate Debt Securities [Member]
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items]
Amortized Cost	15,090
Gross Unrealized gains	0
Gross unrealized losses	152
Estimated Fair Value	14,938
Equity Investment Other [Member]
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items]
Amortized Cost	307	396
Gross Unrealized gains	27	21
Gross unrealized losses	0	0
Estimated Fair Value	$ 334	$ 417

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

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

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