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Note 4 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available-for-sale, amortized costs | $ 472,460 | $ 435,166
Securities available-for-sale, gross unrealized gains | 15,330 | 2,951
Securities available-for-sale, gross unrealized losses | 439 | 2,854
Securities available-for-sale, fair values | 487,351 | 435,263
US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 57,906 | 119,903
Securities available-for-sale, gross unrealized gains | 4,712 | 1,995
Securities available-for-sale, gross unrealized losses | 25 | 775
Securities available-for-sale, fair values | 62,593 | 121,123
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 157,528 | 88,092
Securities available-for-sale, gross unrealized gains | 5,936 | 791
Securities available-for-sale, gross unrealized losses | 350 | 644
Securities available-for-sale, fair values | 163,114 | 88,239
Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale, amortized costs | 254,025 | 223,173
Securities available-for-sale, gross unrealized gains | 4,363 | 45
Securities available-for-sale, gross unrealized losses | 64 | 1,435
Securities available-for-sale, fair values | 258,324 | 221,783
Corporate Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 3,001 | 3,998
Securities available-for-sale, gross unrealized gains | 319 | 120
Securities available-for-sale, fair values | $ 3,320 | $ 4,118

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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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- 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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