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Note 6 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreement to Repurchase (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Securities sold under agreements to repurchase $ 220,936 $ 229,734
Average daily balance during the period 226,139 204,334
Maximum daily balance during the period $ 278,227 $ 269,324
Securities Sold under Agreements to Repurchase [Member]    
Average interest rate at end of period 4.00% 3.17%
Average interest rate during the period 3.32% 1.33%