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Note 4 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale, amortized cost | $ 118,410 | $ 135,656
Available-for-sale, gross unrealized gains | 488 | 174
Available-for-sale, gross unrealized losses | (937) | (3,343)
Available-for-sale, estimated fair value | 117,961 | 132,487
Held-to-maturity, amortized cost | 18,688 | 21,462
Held-to-maturity, gross unrealized gains | 13 |
Held-to-maturity, gross unrealized losses | (127) | (610)
Held-to-maturity, estimated fair value | 18,574 | 20,852
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale, amortized cost | 49,306 | 56,101
Available-for-sale, gross unrealized gains | 46 | 10
Available-for-sale, gross unrealized losses | (603) | (1,822)
Available-for-sale, estimated fair value | 48,749 | 54,289
Held-to-maturity, amortized cost | 10,483 | 11,716
Held-to-maturity, gross unrealized gains |  |
Held-to-maturity, gross unrealized losses | (86) | (349)
Held-to-maturity, estimated fair value | 10,397 | 11,367
US Government Agencies Debt Securities [Member] |  |
Held-to-maturity, amortized cost | 6,548 | 8,026
Held-to-maturity, gross unrealized gains |  |
Held-to-maturity, gross unrealized losses | (40) | (244)
Held-to-maturity, estimated fair value | 6,508 | 7,782
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale, amortized cost | 64,271 | 73,859
Available-for-sale, gross unrealized gains | 330 | 113
Available-for-sale, gross unrealized losses | (334) | (1,517)
Available-for-sale, estimated fair value | 64,267 | 72,455
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale, amortized cost | 4,754 | 5,617
Available-for-sale, gross unrealized gains | 111 | 51
Available-for-sale, gross unrealized losses |  | (4)
Available-for-sale, estimated fair value | 4,865 | 5,664
Held-to-maturity, amortized cost | 1,657 | 1,720
Held-to-maturity, gross unrealized gains | 13 |
Held-to-maturity, gross unrealized losses | (1) | (17)
Held-to-maturity, estimated fair value | 1,669 | 1,703
US Treasury Securities [Member] |  |
Available-for-sale, amortized cost | 79 | 79
Available-for-sale, gross unrealized gains | 1 |
Available-for-sale, gross unrealized losses |  |
Available-for-sale, estimated fair value | $ 80 | $ 79

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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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- 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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