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Note 7 - Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale securities, amortized cost | $ 342,278 | $ 368,725
Available-for-sale securities, gross unrealized holding gains | 5,407 | 1,778
Available-for-sale securities, gross unrealized holding losses | (962) | (7,230)
Available-for-sale debt securities, at fair value | 346,723 | 363,273
US Government Agencies Debt Securities [Member] |  |
Available-for-sale securities, amortized cost | 16,380 | 12,331
Available-for-sale securities, gross unrealized holding gains | 620 | 169
Available-for-sale securities, gross unrealized holding losses | 0 | 0
Available-for-sale debt securities, at fair value | 17,000 | 12,500
Obligations of States and Political Subdivisions Tax Exempt [Member] |  |
Available-for-sale securities, amortized cost | 68,787 | 84,204
Available-for-sale securities, gross unrealized holding gains | 2,011 | 949
Available-for-sale securities, gross unrealized holding losses | (38) | (1,201)
Available-for-sale debt securities, at fair value | 70,760 | 83,952
Obligations of States and Political Subdivisions Taxable [Member] |  |
Available-for-sale securities, amortized cost | 35,446 | 27,618
Available-for-sale securities, gross unrealized holding gains | 927 | 208
Available-for-sale securities, gross unrealized holding losses | (70) | (127)
Available-for-sale debt securities, at fair value | 36,303 | 27,699
Residential Pass-Through Securities [Member] |  |
Available-for-sale securities, amortized cost | 58,875 | 54,827
Available-for-sale securities, gross unrealized holding gains | 472 | 48
Available-for-sale securities, gross unrealized holding losses | (137) | (1,430)
Available-for-sale debt securities, at fair value | 59,210 | 53,445
Residential Collateralized Mortgage Obligations [Member] |  |
Available-for-sale securities, amortized cost | 115,025 | 148,964
Available-for-sale securities, gross unrealized holding gains | 308 | 238
Available-for-sale securities, gross unrealized holding losses | (610) | (3,290)
Available-for-sale debt securities, at fair value | 114,723 | 145,912
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale securities, amortized cost | 47,765 | 40,781
Available-for-sale securities, gross unrealized holding gains | 1,069 | 166
Available-for-sale securities, gross unrealized holding losses | (107) | (1,182)
Available-for-sale debt securities, at fair value | $ 48,727 | $ 39,765

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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=118939692&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=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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