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Note 3 - INVESTMENT SECURITIES - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Securities held to maturity: |  |
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 1 | $ 385,571 |
Securities held to maturity, less than 12 months, gross unrealized losses | (30,028) |
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 1 | 385,571 |
Securities held to maturity, gross unrealized losses | (30,028) |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 286,106 | $ 32,980
Securities available for sale, less than 12 months, gross unrealized losses | (59,576) | (464)
Securities available for sale, 12 months or more, fair value | 35,631 | 23,442
Securities available for sale, 12 months or more, gross unrealized losses | (9,617) | (857)
Securities available for sale, fair value | 321,737 | 56,422
Securities available for sale, gross unrealized losses | (69,193) | (1,321)
Municipal securities. |  |
Securities held to maturity: |  |
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 1 | 385,027 | 1,049
Securities held to maturity, less than 12 months, gross unrealized losses | (30,022) | (1)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 1 | 385,027 | 1,049
Securities held to maturity, gross unrealized losses | (30,022) | (1)
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 175,686 | 13,287
Securities available for sale, less than 12 months, gross unrealized losses | (53,159) | (211)
Securities available for sale, 12 months or more, fair value | 6,536 | 1,001
Securities available for sale, 12 months or more, gross unrealized losses | (2,813) | (4)
Securities available for sale, fair value | 182,222 | 14,288
Securities available for sale, gross unrealized losses | (55,972) | (215)
U.S. treasuries and govt. sponsored agency securities |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 8,705 | 9,802
Securities available for sale, less than 12 months, gross unrealized losses | (349) | (156)
Securities available for sale, 12 months or more, fair value | 10,530 | 3,035
Securities available for sale, 12 months or more, gross unrealized losses | (2,535) | (140)
Securities available for sale, fair value | 19,235 | 12,837
Securities available for sale, gross unrealized losses | (2,884) | (296)
Residential mortgage-backed and related securities |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 51,073 | 5,363
Securities available for sale, less than 12 months, gross unrealized losses | (3,671) | (67)
Securities available for sale, 12 months or more, fair value | 17,669 | 19,406
Securities available for sale, 12 months or more, gross unrealized losses | (4,165) | (713)
Securities available for sale, fair value | 68,742 | 24,769
Securities available for sale, gross unrealized losses | (7,836) | (780)
Asset-backed securities |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 10,742 |
Securities available for sale, less than 12 months, gross unrealized losses | (194) |
Securities available for sale, fair value | 10,742 |
Securities available for sale, gross unrealized losses | (194) |
Other Securities |  |
Securities held to maturity: |  |
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 1 | 544 |
Securities held to maturity, less than 12 months, gross unrealized losses | (6) |
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 1 | 544 |
Securities held to maturity, gross unrealized losses | (6) |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 39,900 | 4,528
Securities available for sale, less than 12 months, gross unrealized losses | (2,203) | (30)
Securities available for sale, 12 months or more, fair value | 896 |
Securities available for sale, 12 months or more, gross unrealized losses | (104) |
Securities available for sale, fair value | 40,796 | 4,528
Securities available for sale, gross unrealized losses | $ (2,307) | $ (30)

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