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Note 7 - Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Securities available for sale	$ 467,505	$ 331,387
Securities available for sale	467,505	331,387
Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0
Securities available for sale		0
Fair Value, Inputs, Level 2 [Member]
Securities available for sale	467,505
Securities available for sale		331,387
Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0
Securities available for sale		0
US Government Agencies Debt Securities [Member]
Securities available for sale	328,043
Securities available for sale	328,043	307,719
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0
Securities available for sale		0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	328,043
Securities available for sale		307,719
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0
Securities available for sale		0
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale	131,929
Securities available for sale	131,929	16,834
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0
Securities available for sale		0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	131,929
Securities available for sale		16,834
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0
Securities available for sale		0
Collateralized Mortgage Backed Securities [Member]
Securities available for sale	752
Securities available for sale	752	659
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0
Securities available for sale		0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	752
Securities available for sale		659
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0
Securities available for sale		0
Corporate Debt Securities [Member]
Securities available for sale	6,781
Securities available for sale	6,781	6,175
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0
Securities available for sale		0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	6,781
Securities available for sale		6,175
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	$ 0
Securities available for sale		$ 0

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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