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Note 3 - Securities - Available for Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available for sale securities, cost basis | $ 397,462 | $ 271,833
Available for sale securities, gross unrealized gains | 14,522 | 6,653
Available for sale securities, gross unrealized losses | (1,315) | (1,267)
Securities available-for-sale | 410,669 | 277,219
Available for sale securities, cost basis | 397,462 | 271,833
Securities available-for-sale | 410,669 | 277,219
Money Market Funds [Member] |  |
Available for sale securities, cost basis | 52,941 | 9,670
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | 0 | 0
Securities available-for-sale | 52,941 | 9,670
Available for sale securities, cost basis | 52,941 | 9,670
Securities available-for-sale | 52,941 | 9,670
US Government-sponsored Enterprises Debt Securities [Member] |  |
Available for sale securities, cost basis | 7,881 |
Available for sale securities, gross unrealized gains | 3 |
Available for sale securities, gross unrealized losses | (24) |
Securities available-for-sale | 7,860 |
Available for sale securities, cost basis | 7,881 |
Securities available-for-sale | 7,860 |
US Treasury Securities [Member] |  |
Available for sale securities, cost basis |  | 12,994
Available for sale securities, gross unrealized gains |  | 64
Available for sale securities, gross unrealized losses |  | 0
Securities available-for-sale |  | 13,058
Available for sale securities, cost basis |  | 12,994
Securities available-for-sale |  | 13,058
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Available for sale securities, cost basis | 151,355 | 149,339
Available for sale securities, gross unrealized gains | 3,417 | 1,745
Available for sale securities, gross unrealized losses | (36) | (96)
Securities available-for-sale | 154,736 | 150,988
Available for sale securities, cost basis | 151,355 | 149,339
Securities available-for-sale | 154,736 | 150,988
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities, cost basis | 183,103 | 97,628
Available for sale securities, gross unrealized gains | 11,102 | 4,844
Available for sale securities, gross unrealized losses | (2) | (45)
Securities available-for-sale | 194,203 | 102,427
Available for sale securities, cost basis | 183,103 | 97,628
Securities available-for-sale | 194,203 | 102,427
Collateralized Debt Obligations [Member] |  |
Available for sale securities, cost basis | 2,182 | 2,202
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (1,253) | (1,126)
Securities available-for-sale | 929 | 1,076
Available for sale securities, cost basis | 2,182 | 2,202
Securities available-for-sale | $ 929 | $ 1,076

X
- 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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