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Note 7 - Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Securities available for sale | $ 448,485 | $ 331,387
Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 448,485 | 331,387
Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
US Government Agencies Debt Securities [Member] |  |
Securities available for sale | 319,971 | 307,719
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 319,971 | 307,719
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale | 121,083 | 16,834
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 121,083 | 16,834
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale | 679 | 659
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 679 | 659
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
Corporate Debt Securities [Member] |  |
Securities available for sale | 6,752 | 6,175
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 6,752 | 6,175
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | $ 0 | $ 0

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- 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 + Details
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