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Note 3 - Investment Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) - USD ($) | Jun. 30, 2026 | Dec. 31, 2025
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Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 249,414,000 | $ 57,763,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (3,148,000) | (138,000)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 255,399,000 | 301,152,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (26,065,000) | (25,276,000)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 504,813,000 | 358,915,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (29,213,000) | (25,414,000)
US Treasury Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 46,465,000 | 7,664,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (390,000) | (7,000)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 20,940,000 | 25,834,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (428,000) | (435,000)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 67,405,000 | 33,498,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (818,000) | (442,000)
US Government Corporations and Agencies Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 27,817,000 | 14,168,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (430,000) | (46,000)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 39,369,000 | 41,820,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,792,000) | (1,903,000)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 67,186,000 | 55,988,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (2,222,000) | (1,949,000)
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 16,859,000 | 1,144,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (182,000) | (1,000)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 35,461,000 | 47,845,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,931,000) | (3,240,000)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 52,320,000 | 48,989,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (3,113,000) | (3,241,000)
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 33,380,000 | 13,402,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (501,000) | (51,000)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 52,532,000 | 58,408,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (12,067,000) | (11,184,000)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 85,912,000 | 71,810,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | (12,568,000) | (11,235,000)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 124,893,000 | 21,385,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,645,000) | (33,000)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 107,097,000 | 127,245,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (8,847,000) | (8,514,000)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 231,990,000 | 148,630,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ (10,492,000) | $ (8,547,000)

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