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Note 4 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Temporarily impaired securities, fair value | $ 574,628 | $ 554,720
Temporarily impaired securities, unrealized losses | (87,499) | (96,074)
Temporarily impaired securities, fair value, less than 12 months | 94,018 | 60,543
Temporarily impaired securities, unrealized losses, less than 12 months | (1,563) | (1,004)
Temporarily impaired securities, fair value, 12 months or longer | 480,610 | 494,177
Temporarily impaired securities, unrealized losses, 12 months or longer | (85,936) | (95,070)
US Government Agencies Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 84,641 | 53,467
Temporarily impaired securities, unrealized losses | (10,649) | (11,674)
Temporarily impaired securities, fair value, less than 12 months | 50,658 | 18,471
Temporarily impaired securities, unrealized losses, less than 12 months | (255) | (60)
Temporarily impaired securities, fair value, 12 months or longer | 33,983 | 34,996
Temporarily impaired securities, unrealized losses, 12 months or longer | (10,394) | (11,614)
Residential Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 350,770 | 364,971
Temporarily impaired securities, unrealized losses | (52,352) | (60,818)
Temporarily impaired securities, fair value, less than 12 months | 21,050 | 26,809
Temporarily impaired securities, unrealized losses, less than 12 months | (377) | (604)
Temporarily impaired securities, fair value, 12 months or longer | 329,720 | 338,162
Temporarily impaired securities, unrealized losses, 12 months or longer | (51,975) | (60,214)
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 21,131 | 20,892
Temporarily impaired securities, unrealized losses | (3,730) | (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 | 21,131 | 20,892
Temporarily impaired securities, unrealized losses, 12 months or longer | (3,730) | (4,097)
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 115,530 | 112,523
Temporarily impaired securities, unrealized losses | (20,752) | (19,460)
Temporarily impaired securities, fair value, less than 12 months | 20,316 | 13,281
Temporarily impaired securities, unrealized losses, less than 12 months | (925) | (322)
Temporarily impaired securities, fair value, 12 months or longer | 95,214 | 99,242
Temporarily impaired securities, unrealized losses, 12 months or longer | (19,827) | (19,138)
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 1,994 | 1,982
Temporarily impaired securities, unrealized losses | (6) | (18)
Temporarily impaired securities, fair value, less than 12 months | 1,994 | 1,982
Temporarily impaired securities, unrealized losses, less than 12 months | (6) | (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 | 562 | 885
Temporarily impaired securities, unrealized losses | (10) | (7)
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 | 562 | 885
Temporarily impaired securities, unrealized losses, 12 months or longer | $ (10) | $ (7)

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