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Note 2 - Securities - Fair Value of Securities Available for Sale and The Related Unrealized Gains and Losses Recognized in Accumulated Comprehensive Income (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost | $ 363,916 | $ 337,865
Gross Unrealized Gains | 8,748 | 3,340
Gross Unrealized Losses | (139) | (1,626)
Fair Value | 372,525 | 339,579
US Treasury and Government [Member] |  |
Amortized Cost | 2,009 | 17,231
Gross Unrealized Gains | 56 | 23
Gross Unrealized Losses | 0 | (39)
Fair Value | 2,065 | 17,215
US Treasury Securities [Member] |  |
Amortized Cost | 1,995 | 1,994
Gross Unrealized Gains | 75 | 14
Gross Unrealized Losses | 0 | 0
Fair Value | 2,070 | 2,008
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized Cost | 256,930 | 172,487
Gross Unrealized Gains | 7,132 | 2,694
Gross Unrealized Losses | (132) | (1,257)
Fair Value | 263,930 | 173,924
Collateralized Mortgage Backed Securities [Member] |  |
Amortized Cost | 99,145 | 142,504
Gross Unrealized Gains | 1,437 | 585
Gross Unrealized Losses | (7) | (329)
Fair Value | 100,575 | 142,760
Corporate Debt Securities [Member] |  |
Amortized Cost | 2,837 | 2,649
Gross Unrealized Gains | 48 | 24
Gross Unrealized Losses | 0 | (1)
Fair Value | 2,885 | 2,672
Trust Preferred Securities [Member] |  |
Amortized Cost | 1,000 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 1,000 | $ 1,000

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- 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=121645371&loc=d3e27161-111563 + Details
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