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Note 4 - Investment Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) $ in Thousands | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 125 | 129
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (2) | $ (3)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 370 | 532
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (83,121) | (98,020)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 465,191 | 485,527
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (83,123) | (98,023)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 465,561 | $ 486,059
US Treasury Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 1 | 1
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (2) | $ (3)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 370 | 489
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (2) | (3)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 370 | $ 489
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 108 | 112
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 43
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (74,529) | (88,547)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 414,315 | 435,505
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (74,529) | (88,547)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 414,315 | $ 435,548
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 1 | 1
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (59) | (123)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,401 | 1,353
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (59) | (123)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 1,401 | $ 1,353
Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 3 | 3
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | (1)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 20 | 25
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 0 | (1)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 20 | $ 25
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 12 | 12
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (8,533) | (9,349)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 49,455 | 48,644
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (8,533) | (9,349)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 49,455 | $ 48,644

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