Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to Bryn Mawr Bank Corporation	$ 10,677	$ 15,286
Denominator for basic earnings per share – weighted average shares outstanding	20,168,498	20,202,969
Effect of dilutive common shares	103,163	247,525
Denominator for diluted earnings per share – adjusted weighted average shares outstanding	20,271,661	20,450,494
Basic earnings per share (in dollars per share)	$ 0.53	$ 0.76
Diluted earnings per share (in dollars per share)	$ 0.53	$ 0.75
Antidilutive shares excluded from computation of average dilutive earnings per share	63,765	870