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Note 8 - Mergers and Acquisitions (Details Textual) - USD ($)
Aug. 05, 2016
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Milton Bancorp, Inc [Member] | Subsequent Event [Member]        
Business Combination, Number of Common Shares of the Acquiring Entity into Which Common Shares of the Acquired Entity May Be Converted 1,636      
Business Acquisition, Cash Which May Be Paid for the Stock of Acquired Entity $ 37,219,000      
Business Combination, Exchange of Acquired Entity's Common Shares for Cash or Common Shares of Acquiring Entity, Common Shares Reallocation Percentage 80.00%      
Business Acquisition, Number of Issued and Outstanding Common Shares of Acquired Entity 400      
Business Combination, Exchange of Acquired Entity's Common Shares for Cash or Common Shares of Acquiring Entity, Cash Reallocation Percentage 20.00%      
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 523,518      
Payments to Acquire Businesses, Portion Financed in Borrowed Funds $ 5,000,000      
Business Combination, Loans Receivable Assumed 113,320,000      
Business Combination, Deposits Assumed 119,219,000      
Business Combination, Loans Payable Assumed 0      
Subsequent Event [Member]        
Assets $ 950,000,000      
Number of Branches 19      
Assets   $ 826,449,000 $ 796,285,000 $ 800,373,000