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Note 4 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Securities available-for-sale, amortized costs | $ 393,237 | $ 431,428
Securities available-for-sale, gross unrealized gains | 3,925 | 1,709
Securities available-for-sale, gross unrealized losses | 815 | 8,127
Securities available-for-sale, fair values | 396,347 | 425,010
US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 287,696 | 306,264
Securities available-for-sale, gross unrealized gains | 1,990 | 449
Securities available-for-sale, gross unrealized losses | 749 | 6,666
Securities available-for-sale, fair values | 288,937 | 300,047
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 101,028 | 118,564
Securities available-for-sale, gross unrealized gains | 1,840 | 1,218
Securities available-for-sale, gross unrealized losses | 65 | 1,166
Securities available-for-sale, fair values | 102,803 | 118,616
Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale, amortized costs | 519 | 586
Securities available-for-sale, gross unrealized gains | 51 | 42
Securities available-for-sale, gross unrealized losses | 0 | 0
Securities available-for-sale, fair values | 570 | 628
Corporate Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 3,994 | 6,014
Securities available-for-sale, gross unrealized gains | 44 |
Securities available-for-sale, gross unrealized losses | 1 | 295
Securities available-for-sale, fair values | $ 4,037 | $ 5,719

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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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