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Note 7 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreement to Repurchase (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Securities sold under agreements to repurchase $ 229,734 $ 194,340
Average daily balance during the year 204,334 200,499
Maximum daily balance during the year $ 269,324 $ 235,577
Securities Sold under Agreements to Repurchase [Member]    
Weighted average interest rate at year end 3.17% 0.75%
Weighted average interest rate during the year 1.33% 0.15%