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Note 3 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Securities HTM: |  |
Securities HTM, Less than 12 Months, Fair Value | $ 347,651 |
Securities HTM, Less than 12 Months, Gross Unrealized Losses | (56,978) |
Securities HTM, Total, Fair Value | 347,651 |
Securities HTM, Total, Gross Unrealized Losses | (56,978) |
Securities AFS: |  |
Securities AFS, Less than 12 Months, Fair Value | 280,669 | $ 32,980
Securities AFS, Less than 12 Months, Gross Unrealized Losses | (48,923) | (464)
Securities AFS, 12 Months or More, Fair Value | 42,212 | 23,442
Securities AFS, 12 Months or More, Gross Unrealized Losses | (10,788) | (857)
Securities AFS, Total, Fair Value | 322,881 | 56,422
Securities AFS, Total, Gross Unrealized Losses | (59,711) | (1,321)
Municipal securities. |  |
Securities HTM: |  |
Securities HTM, Less than 12 Months, Fair Value | 347,651 |
Securities HTM, Less than 12 Months, Gross Unrealized Losses | (56,978) |
Securities HTM, Total, Fair Value | 347,651 |
Securities HTM, Total, Gross Unrealized Losses | (56,978) |
Securities AFS: |  |
Securities AFS, Less than 12 Months, Fair Value | 178,172 | 13,287
Securities AFS, Less than 12 Months, Gross Unrealized Losses | (42,661) | (211)
Securities AFS, 12 Months or More, Fair Value | 9,809 | 1,001
Securities AFS, 12 Months or More, Gross Unrealized Losses | (4,039) | (4)
Securities AFS, Total, Fair Value | 187,981 | 14,288
Securities AFS, Total, Gross Unrealized Losses | (46,700) | (215)
U.S. treasuries and govt. sponsored agency securities |  |
Securities AFS: |  |
Securities AFS, Less than 12 Months, Fair Value | 5,138 | 9,802
Securities AFS, Less than 12 Months, Gross Unrealized Losses | (326) | (156)
Securities AFS, 12 Months or More, Fair Value | 10,591 | 3,035
Securities AFS, 12 Months or More, Gross Unrealized Losses | (2,457) | (140)
Securities AFS, Total, Fair Value | 15,729 | 12,837
Securities AFS, Total, Gross Unrealized Losses | (2,783) | (296)
Residential mortgage-backed and related securities |  |
Securities AFS: |  |
Securities AFS, Less than 12 Months, Fair Value | 48,469 | 5,363
Securities AFS, Less than 12 Months, Gross Unrealized Losses | (3,327) | (67)
Securities AFS, 12 Months or More, Fair Value | 17,690 | 19,406
Securities AFS, 12 Months or More, Gross Unrealized Losses | (3,896) | (713)
Securities AFS, Total, Fair Value | 66,159 | 24,769
Securities AFS, Total, Gross Unrealized Losses | (7,223) | (780)
Asset-backed securities |  |
Securities AFS: |  |
Securities AFS, Less than 12 Months, Fair Value | 13,684 |
Securities AFS, Less than 12 Months, Gross Unrealized Losses | (205) |
Securities AFS, Total, Fair Value | 13,684 |
Securities AFS, Total, Gross Unrealized Losses | (205) |
Other securities |  |
Securities HTM: |  |
Securities HTM, Less than 12 Months, Fair Value |  | 1,049
Securities HTM, Less than 12 Months, Gross Unrealized Losses |  | (1)
Securities HTM, Total, Fair Value |  | 1,049
Securities HTM, Total, Gross Unrealized Losses |  | (1)
Securities AFS: |  |
Securities AFS, Less than 12 Months, Fair Value | 35,206 | 4,528
Securities AFS, Less than 12 Months, Gross Unrealized Losses | (2,404) | (30)
Securities AFS, 12 Months or More, Fair Value | 4,122 |
Securities AFS, 12 Months or More, Gross Unrealized Losses | (396) |
Securities AFS, Total, Fair Value | 39,328 | 4,528
Securities AFS, Total, Gross Unrealized Losses | $ (2,800) | $ (30)

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