Note 4 - Investment Securities - Investment Securities Available for Sale (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Number of investment positions - less than twelve months	165
Fair value - less than twelve months	$ 201,145
Gross unrealized losses - less than twelve months	$ 4,463
Number of investment positions - more than twelve months	6
Fair value - more than twelve months	$ 3,033
Gross unrealized losses - more than twelve months	$ 62
Number of investment positions	171
Fair value	$ 204,178
Gross unrealized losses	$ 4,525
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Number of investment positions - less than twelve months	78
Fair value - less than twelve months	$ 101,838
Gross unrealized losses - less than twelve months	$ 2,336
Number of investment positions - more than twelve months	1
Fair value - more than twelve months	$ 531
Gross unrealized losses - more than twelve months	$ 13
Agency Collateralized Mortgage Obligations [Member]
Number of investment positions - less than twelve months	13
Fair value - less than twelve months	$ 11,767
Gross unrealized losses - less than twelve months	$ 239
Number of investment positions - more than twelve months	5
Fair value - more than twelve months	$ 2,502
Gross unrealized losses - more than twelve months	$ 49
US Government Agencies Debt Securities [Member]
Number of investment positions - less than twelve months	20
Fair value - less than twelve months	$ 59,126
Gross unrealized losses - less than twelve months	$ 759
Municipal Notes [Member]
Number of investment positions - less than twelve months	54
Fair value - less than twelve months	$ 28,414
Gross unrealized losses - less than twelve months	$ 1,129

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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