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Note 3 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Securities HTM: |  |
Securities HTM, Less than 12 Months, Fair Value | $ 1,855 |
Securities HTM, Less than 12 Months, Gross Unrealized Losses | (26) |
Securities HTM, 12 Months or More, Fair Value | 289,891 |
Securities HTM, 12 Months or More, Gross Unrealized Losses | (36,628) |
Securities HTM, Total, Fair Value | 291,746 |
Securities HTM, Total, Gross Unrealized Losses | (36,654) |
Securities AFS: |  |
Securities AFS, Less than 12 Months, Fair Value | 4,088 | $ 280,669
Securities AFS, Less than 12 Months, Gross Unrealized Losses | (395) | (48,923)
Securities AFS, 12 Months or More, Fair Value | 282,087 | 42,212
Securities AFS, 12 Months or More, Gross Unrealized Losses | (47,784) | (10,788)
Securities AFS, Total, Fair Value | 286,175 | 322,881
Securities AFS, Total, Gross Unrealized Losses | (48,179) | (59,711)
Municipal securities. |  |
Securities HTM: |  |
Securities HTM, Less than 12 Months, Fair Value | 1,320 | 347,651
Securities HTM, Less than 12 Months, Gross Unrealized Losses | (11) | (56,798)
Securities HTM, 12 Months or More, Fair Value | 289,891 |
Securities HTM, 12 Months or More, Gross Unrealized Losses | (36,628) |
Securities HTM, Total, Fair Value | 291,211 | 347,651
Securities HTM, Total, Gross Unrealized Losses | (36,639) | (56,798)
Securities AFS: |  |
Securities AFS, Less than 12 Months, Fair Value | 283 | 178,172
Securities AFS, Less than 12 Months, Gross Unrealized Losses | (2) | (42,661)
Securities AFS, 12 Months or More, Fair Value | 169,876 | 9,809
Securities AFS, 12 Months or More, Gross Unrealized Losses | (35,588) | (4,039)
Securities AFS, Total, Fair Value | 170,159 | 187,981
Securities AFS, Total, Gross Unrealized Losses | (35,590) | (46,700)
U.S. treasuries and govt. sponsored agency securities |  |
Securities AFS: |  |
Securities AFS, Less than 12 Months, Fair Value |  | 5,138
Securities AFS, Less than 12 Months, Gross Unrealized Losses |  | (326)
Securities AFS, 12 Months or More, Fair Value | 14,018 | 10,591
Securities AFS, 12 Months or More, Gross Unrealized Losses | (2,438) | (2,457)
Securities AFS, Total, Fair Value | 14,018 | 15,729
Securities AFS, Total, Gross Unrealized Losses | (2,438) | (2,783)
Residential mortgage-backed and related securities |  |
Securities AFS: |  |
Securities AFS, Less than 12 Months, Fair Value |  | 48,469
Securities AFS, Less than 12 Months, Gross Unrealized Losses |  | (3,327)
Securities AFS, 12 Months or More, Fair Value | 59,118 | 17,690
Securities AFS, 12 Months or More, Gross Unrealized Losses | (5,972) | (3,896)
Securities AFS, Total, Fair Value | 59,118 | 66,159
Securities AFS, Total, Gross Unrealized Losses | (5,972) | (7,223)
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, 12 Months or More, Fair Value | 3,804 |
Securities AFS, 12 Months or More, Gross Unrealized Losses | (5) |
Securities AFS, Total, Fair Value | 3,804 | 13,684
Securities AFS, Total, Gross Unrealized Losses | (5) | (205)
Other securities |  |
Securities HTM: |  |
Securities HTM, Less than 12 Months, Fair Value | 535 |
Securities HTM, Less than 12 Months, Gross Unrealized Losses | (15) |
Securities HTM, Total, Fair Value | 535 |
Securities HTM, Total, Gross Unrealized Losses | (15) |
Securities AFS: |  |
Securities AFS, Less than 12 Months, Fair Value | 3,805 | 35,206
Securities AFS, Less than 12 Months, Gross Unrealized Losses | (393) | (2,404)
Securities AFS, 12 Months or More, Fair Value | 35,271 | 4,122
Securities AFS, 12 Months or More, Gross Unrealized Losses | (3,781) | (396)
Securities AFS, Total, Fair Value | 39,076 | 39,328
Securities AFS, Total, Gross Unrealized Losses | $ (4,174) | $ (2,800)

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