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Note 15 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Balance | $ 760,432 |  |
Balance | 858,103 | $ 760,432 |
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] |  |  |
Balance | (115,648) | (7,657) | $ 9,309
Net current period other comprehensive income (loss) | 22,970 | (107,991) | (16,966)
Balance | (92,678) | (115,648) | (7,657)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |
Balance | 0 | 0 | (121)
Net current period other comprehensive income (loss) | (179) | 0 | 121
Balance | (179) | 0 | 0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Balance | 112 | (283) | (447)
Net current period other comprehensive income (loss) | (53) | 395 | 164
Balance | 59 | 112 | (283)
AOCI Attributable to Parent [Member] |  |  |
Balance | (115,536) | (7,940) | 8,741
Net current period other comprehensive income (loss) | 22,738 | (107,596) | (16,681)
Balance | $ (92,798) | $ (115,536) | $ (7,940)

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