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Note 10 - Borrowings (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Apr. 30, 2020
Mar. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Long-term Debt, Total   $ 0 $ 0  
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   703,900 703,900  
Unsecured Line of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   15,000 $ 15,000  
Debt Instrument, Basis Spread on Variable Rate     2.00%  
Proceeds from Lines of Credit, Total   1,000    
Long-term Line of Credit, Total       $ 0
Unsecured Line of Credit [Member] | Subsequent Event [Member]        
Repayments of Lines of Credit $ 1,000      
Federal Home Loan Bank Borrowings [Member]        
Debt Instrument, Unused Borrowing Capacity, Amount   235,670 $ 235,670  
Deposit Liabilities, Collateral Issued, Financial Instruments   $ 169,070 $ 169,070