Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income attributable to Bryn Mawr Bank Corporation	$ 15,785	$ 14,688	$ 26,462	$ 29,974
Denominator for basic earnings per share – weighted average shares outstanding (in shares)	20,144,651	20,238,852	20,156,509	20,221,010
Effect of dilutive common shares (in shares)	99,758	174,726	99,960	206,782
Denominator for diluted earnings per share – adjusted weighted average shares outstanding (in shares)	20,244,409	20,413,578	20,256,469	20,427,792
Basic earnings per share (in dollars per share)	$ 0.78	$ 0.73	$ 1.31	$ 1.48
Diluted earnings per share (in dollars per share)	$ 0.78	$ 0.72	$ 1.31	$ 1.47
Antidilutive shares excluded from computation of average dilutive earnings per share (in shares)	14,441	1,422	30,506	2,495