Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income attributable to Bryn Mawr Bank Corporation	$ 63,792	$ 23,016	$ 36,036
Net change in unrealized losses on investment securities available for sale:
Net unrealized losses arising during the period, net of tax benefit of $(806), $(570) and $(1,106), respectively	(3,033)	(1,057)	(2,055)
Reclassification adjustment for net (gain) loss on sale realized in net income, net of tax (expense) benefit of $(1), $(35), and $27, respectively	(6)	(66)	50
Reclassification adjustment for net gain realized on transfer of investment securities available for sale to trading, net of tax expense of $(88), $0 and $0, respectively	(329)	0	0
Unrealized investment losses, net of tax benefit of $(895), $(605) and $(1,079), respectively	(3,368)	(1,123)	(2,005)
Net change in unfunded pension liability:
Change in unfunded pension liability related to unrealized loss, prior service cost and transition obligation, net of tax expense (benefit) of $72, $(54) and $5, respectively	269	(100)	8
Total other comprehensive loss	(3,099)	(1,223)	(1,997)
Total comprehensive income	$ 60,693	$ 21,793	$ 34,039