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Note 3 - Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available for sale securities, amortized cost | $ 364,252 | $ 363,433
Available for sale securities, gross unrealized gains | 917 | 321
Available for sale securities, gross unrealized losses | (7,280) | (10,688)
Available for Sale, at Fair Value | 357,889 | 353,066
US Government Agencies Debt Securities [Member] |  |
Available for sale securities, amortized cost | 357,480 | 356,498
Available for sale securities, gross unrealized gains | 883 | 303
Available for sale securities, gross unrealized losses | (7,225) | (10,596)
Available for Sale, at Fair Value | 351,138 | 346,205
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities, amortized cost | 3,873 | 4,008
Available for sale securities, gross unrealized gains | 34 | 18
Available for sale securities, gross unrealized losses | (12) | (37)
Available for Sale, at Fair Value | 3,895 | 3,989
Corporate Debt Securities [Member] |  |
Available for sale securities, amortized cost | 2,899 | 2,927
Available for sale securities, gross unrealized gains |  |
Available for sale securities, gross unrealized losses | (43) | (55)
Available for Sale, at Fair Value | $ 2,856 | $ 2,872

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amortized cost 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 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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