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Note 6 - Securities - Available for Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available for sale securities, cost basis | $ 451,425 | $ 455,477
Available for sale securities, gross unrealized gains | 69 | 7
Available for sale securities, gross unrealized losses | (73,593) | (84,588)
Available for sale securities, estimated fair value | 377,901 | 370,896
US Government-sponsored Enterprises Debt Securities [Member] |  |
Available for sale securities, cost basis | 8,883 | 8,883
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (1,141) | (1,258)
Available for sale securities, estimated fair value | 7,742 | 7,625
US Treasury Securities [Member] |  |
Available for sale securities, cost basis | 389 | 389
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | 0 | 0
Available for sale securities, estimated fair value | 389 | 389
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Available for sale securities, cost basis | 159,376 | 163,000
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (26,067) | (28,884)
Available for sale securities, estimated fair value | 133,309 | 134,116
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities, cost basis | 280,604 | 281,032
Available for sale securities, gross unrealized gains | 69 | 7
Available for sale securities, gross unrealized losses | (45,229) | (53,321)
Available for sale securities, estimated fair value | 235,444 | 227,718
Collateralized Debt Obligations [Member] |  |
Available for sale securities, cost basis | 2,173 | 2,173
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (1,156) | (1,125)
Available for sale securities, estimated fair value | $ 1,017 | $ 1,048

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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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