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Note 5 - Investment Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 141 | 129
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (1,715) | $ (3)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 116,800 | 532
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (96,807) | (98,020)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 440,830 | 485,527
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (98,522) | (98,023)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 557,630 | $ 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 | $ 0 | $ (3)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 489
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2) | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 327 | 0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (2) | (3)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 327 | $ 489
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 124 | 112
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (1,715) | $ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 116,800 | 43
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (91,090) | (88,547)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 386,864 | 435,505
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (92,805) | (88,547)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 503,664 | $ 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 | (99) | (123)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,251 | 1,353
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (99) | (123)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 1,251 | $ 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 | 18 | 25
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 0 | (1)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 18 | $ 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 | (5,616) | (9,349)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 52,370 | 48,644
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (5,616) | (9,349)
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 52,370 | $ 48,644

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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