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Note 3 - Investment Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) $ in Thousands | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 135 | 141
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (263) | $ (1,715)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 56,387 | 116,800
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (84,050) | (96,807)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 442,867 | 440,830
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (84,313) | (98,522)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 499,254 | $ 557,630
US Treasury Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 2 | 1
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (1) | $ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 351 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | (2)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 308 | 327
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (2) | (2)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 659 | $ 327
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 117 | 124
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (262) | $ (1,715)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 56,036 | 116,800
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (80,056) | (91,090)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 387,207 | 386,864
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (80,318) | (92,805)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 443,243 | $ 503,664
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 | (69) | (99)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,274 | 1,251
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (69) | (99)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 1,274 | $ 1,251
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 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 18 | 18
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 18 | $ 18
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 | (3,924) | (5,616)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 54,060 | 52,370
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (3,924) | (5,616)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 54,060 | $ 52,370

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