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Note 9 - Borrowings (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase   $ (26,287) $ (2,217)  
Long-term Debt, Total   0    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   824,040    
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
Federal Home Loan Bank Borrowings [Member]        
Debt Instrument, Unused Borrowing Capacity, Amount   379,090    
Deposit Liabilities, Collateral Issued, Financial Instruments   145,430    
Wholesale Repurchase Agreements [Member]        
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase $ (25,000) $ (25,000)