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Note 11 - Borrowings (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements   54 days    
Long-term Federal Home Loan Bank Advances, Noncurrent   $ 50,000    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties $ 1,100 1,096
Debt Instrument, Unused Borrowing Capacity, Amount   402,740    
Deposit Liabilities, Collateral Issued, Financial Instruments   144,380    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   874,170    
Unsecured Line of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 15,000    
Debt Instrument, Basis Spread on Variable Rate   2.00%    
Long-term Line of Credit, Total   $ 0 $ 0