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Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Common Stock [Member] |  |  |
Common stock issued to ESOP, shares (in shares) | 24,572 |  | 14,618
Common stock issued through dividend reinvestment, shares (in shares) |  |  | 4,304
Acquisition – Milton Bancorp, Inc., shares (in shares) | 523,518 |  |
Retained Earnings [Member] |  |  |
Cash dividends, per share (in dollars per share) | $ 0.82 | $ 0.89 | $ 0.84
Common stock issued to ESOP, shares (in shares) | 24,572 |  | 14,618

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