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Note 8 - Borrowings - Components of Borrowings (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Securities sold under agreements to repurchase $ 83,783 $ 98,005 [1]
Other debt 244
Total borrowings 133,783 178,713
Subordinated Debt [Member]    
Subordinated debt $ 15,464
Subordinated debt, rate 3.65%
Federal Home Loan Bank Borrowings [Member] | Long-term Advances [Member]    
Long-term FHLB advances, amount $ 50,000 $ 65,000
Long-term FHLB advances, rate 4.00% 4.04%
Retail Repurchase Agreements [Member]    
Securities sold under agreements to repurchase $ 58,783 $ 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%
[1] Derived from audited financial statements