Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) $ in Thousands	USD ($) $ / shares
Balance at beginning of period at Dec. 31, 2014	$ 86,216
Net Income	6,676
Other comprehensive income (loss), net of tax	(136)
Acquisition – Milton Bancorp, Inc., 523,518 shares
Common stock issued to ESOP, 24,572 shares
Cash dividends	(2,801)
Balance at end of period at Sep. 30, 2015	$ 89,955
Cash dividends per share (in dollars per share) | $ / shares	$ 0.68
Balance at beginning of period at Jun. 30, 2015	$ 88,885
Net Income	1,642
Other comprehensive income (loss), net of tax	293
Acquisition – Milton Bancorp, Inc., 523,518 shares
Common stock issued to ESOP, 24,572 shares
Cash dividends	(865)
Balance at end of period at Sep. 30, 2015	$ 89,955
Cash dividends per share (in dollars per share) | $ / shares	$ 0.21
Balance at beginning of period at Dec. 31, 2015	$ 90,470
Net Income	4,896
Other comprehensive income (loss), net of tax	1,008
Acquisition – Milton Bancorp, Inc., 523,518 shares	11,444
Common stock issued to ESOP, 24,572 shares	575
Cash dividends	(2,605)
Balance at end of period at Sep. 30, 2016	$ 105,788
Cash dividends per share (in dollars per share) | $ / shares	$ 0.61
Balance at beginning of period at Jun. 30, 2016	$ 94,796
Net Income	358
Other comprehensive income (loss), net of tax	60
Acquisition – Milton Bancorp, Inc., 523,518 shares	11,444
Common stock issued to ESOP, 24,572 shares
Cash dividends	(870)
Balance at end of period at Sep. 30, 2016	$ 105,788
Cash dividends per share (in dollars per share) | $ / shares	$ 0.19