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Note 8 - Borrowings (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 888,310  
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 371,960  
Deposit Liabilities, Collateral Issued, Financial Instruments $ 139,180