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Note 6 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreement to Repurchase (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Securities sold under agreements to repurchase $ 242,785 $ 121,521
Average daily balance during the period 231,926 224,878
Maximum daily balance during the period $ 285,549 $ 278,227
Securities Sold under Agreements to Repurchase [Member]    
Average interest rate at end of period 3.17% 2.17%
Average interest rate during the period 3.20% 3.43%