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Note 6 - Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale securities, amortized cost | $ 330,731 | $ 342,278
Available-for-sale securities, gross unrealized holding gains | 11,787 | 5,407
Available-for-sale securities, gross unrealized holding losses | (102) | (962)
Available-for-sale debt securities, at fair value | 342,416 | 346,723
US Government Agencies Debt Securities [Member] |  |
Available-for-sale securities, amortized cost | 15,704 | 16,380
Available-for-sale securities, gross unrealized holding gains | 704 | 620
Available-for-sale securities, gross unrealized holding losses | 0 | 0
Available-for-sale debt securities, at fair value | 16,408 | 17,000
Obligations of States and Political Subdivisions Tax Exempt [Member] |  |
Available-for-sale securities, amortized cost | 78,126 | 68,787
Available-for-sale securities, gross unrealized holding gains | 2,982 | 2,011
Available-for-sale securities, gross unrealized holding losses | (36) | (38)
Available-for-sale debt securities, at fair value | 81,072 | 70,760
Obligations of States and Political Subdivisions Taxable [Member] |  |
Available-for-sale securities, amortized cost | 35,764 | 35,446
Available-for-sale securities, gross unrealized holding gains | 1,348 | 927
Available-for-sale securities, gross unrealized holding losses | (38) | (70)
Available-for-sale debt securities, at fair value | 37,074 | 36,303
Residential Pass-Through Securities [Member] |  |
Available-for-sale securities, amortized cost | 54,280 | 58,875
Available-for-sale securities, gross unrealized holding gains | 1,472 | 472
Available-for-sale securities, gross unrealized holding losses | 0 | (137)
Available-for-sale debt securities, at fair value | 55,752 | 59,210
Residential Collateralized Mortgage Obligations [Member] |  |
Available-for-sale securities, amortized cost | 101,130 | 115,025
Available-for-sale securities, gross unrealized holding gains | 2,435 | 308
Available-for-sale securities, gross unrealized holding losses | (9) | (610)
Available-for-sale debt securities, at fair value | 103,556 | 114,723
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale securities, amortized cost | 45,727 | 47,765
Available-for-sale securities, gross unrealized holding gains | 2,846 | 1,069
Available-for-sale securities, gross unrealized holding losses | (19) | (107)
Available-for-sale debt securities, at fair value | $ 48,554 | $ 48,727

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=121645371&loc=d3e27161-111563 + Details
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X
- 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=121645371&loc=d3e27161-111563 + Details
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