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Note 10 - Borrowed Funds (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 506,400 $ 340,000
Federal Funds Purchased 149  
Other Borrowings   0
Federal Home Loan Bank Advances [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 25,000  
Long-term Line of Credit, Total $ 0 $ 0