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Note 3 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | $ 1,059 | $ 114,750
Securities held to maturity, less than 12 months, gross unrealized losses | (1) | (2,188)
Securities held to maturity, 12 months or more, fair value | 10,047 | 69,412
Securities held to maturity, 12 months or more, gross unrealized losses | (142) | (4,616)
Securities held to maturity, fair value | 11,106 | 184,162
Securities held to maturity, gross unrealized losses | (143) | (6,804)
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 20,829 | 46,980
Securities available for sale, less than 12 months, gross unrealized losses | (110) | (580)
Securities available for sale, 12 months or more, fair value | 20,703 | 179,072
Securities available for sale, 12 months or more, gross unrealized losses | (225) | (5,536)
Securities available for sale, fair value | 41,532 | 226,052
Securities available for sale, gross unrealized losses | (335) | (6,116)
US States and Political Subdivisions Debt Securities |  |
Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | 509 | 114,201
Securities held to maturity, less than 12 months, gross unrealized losses | (1) | (2,187)
Securities held to maturity, 12 months or more, fair value | 10,047 | 69,412
Securities held to maturity, 12 months or more, gross unrealized losses | (142) | (4,616)
Securities held to maturity, fair value | 10,556 | 183,613
Securities held to maturity, gross unrealized losses | (143) | (6,803)
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 0 | 28,356
Securities available for sale, less than 12 months, gross unrealized losses | 0 | (394)
Securities available for sale, 12 months or more, fair value | 724 | 15,932
Securities available for sale, 12 months or more, gross unrealized losses | (4) | (309)
Securities available for sale, fair value | 724 | 44,288
Securities available for sale, gross unrealized losses | (4) | (703)
US Government Agencies Debt Securities |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 1,431 | 1,565
Securities available for sale, less than 12 months, gross unrealized losses | (21) | (34)
Securities available for sale, 12 months or more, fair value | 2,117 | 29,605
Securities available for sale, 12 months or more, gross unrealized losses | (56) | (744)
Securities available for sale, fair value | 3,548 | 31,170
Securities available for sale, gross unrealized losses | (77) | (778)
Residential mortgage-backed and related securities |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 2,263 | 12,810
Securities available for sale, less than 12 months, gross unrealized losses | (17) | (148)
Securities available for sale, 12 months or more, fair value | 17,862 | 133,535
Securities available for sale, 12 months or more, gross unrealized losses | (165) | (4,483)
Securities available for sale, fair value | 20,125 | 146,345
Securities available for sale, gross unrealized losses | (182) | (4,631)
Other Securities |  |
Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | 550 | 549
Securities held to maturity, less than 12 months, gross unrealized losses |  | (1)
Securities held to maturity, fair value | 550 | 549
Securities held to maturity, gross unrealized losses |  | (1)
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 17,135 | 4,249
Securities available for sale, less than 12 months, gross unrealized losses | (72) | (4)
Securities available for sale, 12 months or more, fair value | 0 |
Securities available for sale, 12 months or more, gross unrealized losses | 0 |
Securities available for sale, fair value | 17,135 | 4,249
Securities available for sale, gross unrealized losses | $ (72) | $ (4)

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