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Note 3 - Securities - Available for Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available for sale securities, cost basis | $ 463,543 | $ 397,462
Available for sale securities, gross unrealized gains | 13,125 | 14,522
Available for sale securities, gross unrealized losses | (2,741) | (1,315)
Total securities available-for-sale | 473,927 | 410,669
US Government-sponsored Enterprises Debt Securities [Member] |  |
Available for sale securities, cost basis | 10,883 |
Available for sale securities, gross unrealized gains | 5 |
Available for sale securities, gross unrealized losses | (92) |
Total securities available-for-sale | 10,796 |
Money Market Funds [Member] |  |
Available for sale securities, cost basis |  | 52,941
Available for sale securities, gross unrealized gains |  | 0
Available for sale securities, gross unrealized losses |  | 0
Total securities available-for-sale |  | 52,941
US Treasury Securities [Member] |  |
Available for sale securities, cost basis | 401 | 7,881
Available for sale securities, gross unrealized gains | 0 | 3
Available for sale securities, gross unrealized losses | 0 | (24)
Total securities available-for-sale | 401 | 7,860
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Available for sale securities, cost basis | 194,601 | 151,355
Available for sale securities, gross unrealized gains | 2,009 | 3,417
Available for sale securities, gross unrealized losses | (1,249) | (36)
Total securities available-for-sale | 195,361 | 154,736
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities, cost basis | 255,485 | 183,103
Available for sale securities, gross unrealized gains | 11,111 | 11,102
Available for sale securities, gross unrealized losses | (197) | (2)
Total securities available-for-sale | 266,399 | 194,203
Collateralized Debt Obligations [Member] |  |
Available for sale securities, cost basis | 2,173 | 2,182
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (1,203) | (1,253)
Total securities available-for-sale | $ 970 | $ 929

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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=123581744&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=123581744&loc=d3e27161-111563 + Details
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