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Note 11 - Borrowings - Components of Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2003
Securities sold under agreements to repurchase $ 30,086 $ 98,005  
Other debt 244  
Total borrowings 80,086 178,713  
Junior Subordinated Debt [Member]      
Subordinated debt $ 15,464 $ 15,460
Subordinated debt, rate 3.65%  
Federal Home Loan Bank Borrowings [Member] | Long-term Advances [Member]      
FHLB advances $ 50,000 $ 65,000  
FHLB advances 4.00% 4.04%  
Retail Repurchase Agreements [Member]      
Securities sold under agreements to repurchase $ 5,086 $ 73,005  
Weighted average contractual rate 0.07% 0.07%  
Wholesale Repurchase Agreements [Member]      
Securities sold under agreements to repurchase $ 25,000 $ 25,000  
Weighted average contractual rate 3.18% 3.18%