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Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Additional Paid-in Capital [Member] |  |  |
Common stock issued to ESOP, shares (in shares) | 7,294 | 15,118 | 24,572
Acquisition – Milton Bancorp, Inc., shares (in shares) |  |  | 523,518
Common stock issued through dividend reinvestment, shares (in shares) | 30,766 | 21,383 |
Retained Earnings [Member] |  |  |
Cash dividends, per share (in dollars per share) | $ 0.84 | $ 0.84 | $ 0.82
Common stock issued to ESOP, shares (in shares) | 7,294 | 15,118 | 24,572

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