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Note 6 - Other Borrowed Funds (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Total $ 31,926  
Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, Total 0  
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available 226,640  
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds $ 134,714  
Debt, Weighted Average Interest Rate 2.77% 2.83%
Notes Payable to Bank, Total $ 1,824 $ 2,451
Director [Member]    
Notes Payable, Related Parties 3,558 3,558
FHLB Line of Credit [Member]    
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available 80,000  
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds 80,000  
Letters of Credit Outstanding, Amount $ 60,000 $ 51,700
Minimum [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 1.53%  
Debt Instrument, Interest Rate, Stated Percentage 1.50%  
Maximum [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 3.31%  
Debt Instrument, Interest Rate, Stated Percentage 4.09%  
Weighted Average [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 2.42%  
FHLB Stock [Member]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 5,365  
Residential Real Estate [Member]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 293,294  
Commercial Loans [Member]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 67,111