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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