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Note 6 - Other Borrowed Funds (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Total $ 34,109  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 2.36%  
Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, Total $ 0  
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available 238,871  
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds $ 151,462  
Debt, Weighted Average Interest Rate 2.83% 2.77%
Notes Payable to Bank, Total $ 2,578 $ 3,440
Letters of Credit Outstanding, Amount 53,300  
Director [Member]    
Notes Payable, Related Parties 360 360
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
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%  
Residential Real Estate [Member]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 296,332  
Commercial Loans [Member]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 70,705  
FHLB Stock [Member]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 5,365  
Federal Home Loan Bank Advances [Member]    
Capital Lease Obligations, Total   $ 29