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Note 4 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Temporarily impaired securities, fair value | $ 545,720 | $ 554,720
Temporarily impaired securities, unrealized losses | (89,079) | (96,074)
Temporarily impaired securities, fair value, less than 12 months | 54,761 | 60,543
Temporarily impaired securities, unrealized losses, less than 12 months | (1,119) | (1,004)
Temporarily impaired securities, fair value, 12 months or longer | 490,959 | 494,177
Temporarily impaired securities, unrealized losses, 12 months or longer | (87,960) | (95,070)
US Government Agencies Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 56,703 | 53,467
Temporarily impaired securities, unrealized losses | (10,690) | (11,674)
Temporarily impaired securities, fair value, less than 12 months | 21,699 | 18,471
Temporarily impaired securities, unrealized losses, less than 12 months | (72) | (60)
Temporarily impaired securities, fair value, 12 months or longer | 35,004 | 34,996
Temporarily impaired securities, unrealized losses, 12 months or longer | (10,618) | (11,614)
Residential Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 351,709 | 364,971
Temporarily impaired securities, unrealized losses | (53,392) | (60,818)
Temporarily impaired securities, fair value, less than 12 months | 13,622 | 26,809
Temporarily impaired securities, unrealized losses, less than 12 months | (297) | (604)
Temporarily impaired securities, fair value, 12 months or longer | 338,087 | 338,162
Temporarily impaired securities, unrealized losses, 12 months or longer | (53,095) | (60,214)
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 21,051 | 20,892
Temporarily impaired securities, unrealized losses | (3,874) | (4,097)
Temporarily impaired securities, fair value, less than 12 months | 0 | 0
Temporarily impaired securities, unrealized losses, less than 12 months | 0 | 0
Temporarily impaired securities, fair value, 12 months or longer | 21,051 | 20,892
Temporarily impaired securities, unrealized losses, 12 months or longer | (3,874) | (4,097)
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 115,666 | 112,523
Temporarily impaired securities, unrealized losses | (21,116) | (19,460)
Temporarily impaired securities, fair value, less than 12 months | 19,440 | 13,281
Temporarily impaired securities, unrealized losses, less than 12 months | (750) | (322)
Temporarily impaired securities, fair value, 12 months or longer | 96,226 | 99,242
Temporarily impaired securities, unrealized losses, 12 months or longer | (20,366) | (19,138)
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 0 | 1,982
Temporarily impaired securities, unrealized losses | 0 | (18)
Temporarily impaired securities, fair value, less than 12 months |  | 1,982
Temporarily impaired securities, unrealized losses, less than 12 months |  | (18)
Temporarily impaired securities, fair value, 12 months or longer | 0 | 0
Temporarily impaired securities, unrealized losses, 12 months or longer | 0 | 0
Asset-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 591 | 885
Temporarily impaired securities, unrealized losses | (7) | (7)
Temporarily impaired securities, fair value, less than 12 months |  | 0
Temporarily impaired securities, unrealized losses, less than 12 months |  | 0
Temporarily impaired securities, fair value, 12 months or longer | 591 | 885
Temporarily impaired securities, unrealized losses, 12 months or longer | $ (7) | $ (7)

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