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Note 8 - Mergers and Acquisitions (Details) | Jan. 07, 2016 USD ($) $ / shares shares | Jan. 06, 2016 | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Mar. 31, 2015 USD ($)
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Note 8 - Mergers and Acquisitions (Details) [Line Items] |  |  |  |  |
Assets |  |  | $ 883,517,000 | $ 796,285,000 | $ 867,985,000
Milton Bancorp, Inc. [Member] |  |  |  |  |
Note 8 - Mergers and Acquisitions (Details) [Line Items] |  |  |  |  |
Business Acquisition, Number of Issued and Outstanding Common Shares of Acquired Entity (in Shares) | shares | 400 |  |  |  |
Business Combination, Number of Common Shares of the Acquiring Entity into Which CommonShares of the Acquired Entity May Be Converted (in Shares) | shares | 1,636 |  |  |  |
Business Acquisition, Cash Which May Be Paid for the Stock of Acquired Entity | $ 37,219 |  |  |  |
Business Combination, Exchange of Acquired Entity's Common Shares for Cash or Common Shares of Acquiring Entity, Cash Reallocation Percentage | 20.00% |  |  |  |
Business Combination, Exchange of Acquired Entity's Common Shares for Cash or Common Shares of Acquiring Entity, Common Shares Reallocation Percentage | 80.00% |  |  |  |
Business Combination, Number of Acquired Entity's Preferred Shares to Be Converted into the Right to Receive Cash (in Shares) | shares | 1,237 |  |  |  |
Business Combination, Conversion of Acquired Entity's Preferred Shares into the Right to Receive Cash, Cash Per Preferred Share (in Dollars per share) | $ / shares | $ 3,600 |  |  |  |
Number of Branches | 19 | 5 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 141,000,000 |  |  |  |
Business Combination, Loans Payable Assumed | 110,000,000 |  |  |  |
Business Combination, Deposits Assumed | 126,000,000 |  |  |  |
Business Combination, Consideration Transferred | 20,000,000 |  |  |  |
Minimum [Member] | Milton Bancorp, Inc. [Member] |  |  |  |  |
Note 8 - Mergers and Acquisitions (Details) [Line Items] |  |  |  |  |
Assets | $ 900,000,000 |  |  |  |

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