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Note 6 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Balance | $ 847,197 | $ 790,449 | $ 729,030 | $ 532,606 | $ 501,658 | $ 471,252 | $ 729,030 | $ 471,252
Other comprehensive income (loss) | 9,541 | 3,009 | 10,203 | 17,916 | (1,550) | (2,514) |  |
Balance | 878,110 | 847,197 | 790,449 | 703,313 | 532,606 | 501,658 | 878,110 | 703,313
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Balance | (13,633) | (16,642) | (26,845) | (28,055) | (26,505) | (23,991) | (26,845) | (23,991)
Other comprehensive income (loss) before reclassification |  |  |  |  |  |  | 28,478 | 17,265
Federal income tax (benefit) expense |  |  |  |  |  |  | (5,922) | (3,626)
Other comprehensive income (loss) before reclassification, net of tax |  |  |  |  |  |  | 22,556 | 13,639
Amounts reclassified from AOCI |  |  |  |  |  |  | 249 | 270
Federal income tax (benefit) expense |  |  |  |  |  |  | (52) | (57)
Amounts reclassified from AOCI, net of tax |  |  |  |  |  |  | 197 | 213
Other comprehensive income (loss) | 9,541 | 3,009 | 10,203 | 17,916 | (1,550) | (2,514) | 22,753 | 13,852
Balance | $ (4,092) | $ (13,633) | $ (16,642) | $ (10,139) | $ (28,055) | $ (26,505) | $ (4,092) | $ (10,139)

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