Consolidated Statements of Comprehensive Income - Unaudited - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income attributable to Bryn Mawr Bank Corporation	$ 15,785	$ 14,688	$ 26,462	$ 29,974
Net change in unrealized gains (losses) on investment securities available for sale:
Net unrealized gains (losses) arising during the period, net of tax expense (benefit) of $1,319, $(402), $2,441, and $(1,721), respectively	4,962	(1,512)	9,181	(6,473)
Reclassification adjustment for net (gain) on sale realized in net income, net of tax expense of $0, $0, $0, and $1 respectively	0	0	0	(6)
Reclassification adjustment for net (gain) realized on transfer of investment securities available for sale to trading, net of tax expense of $0, $0, $0, and $88 respectively	0	0	0	(329)
Unrealized investment gains (losses), net of tax expense (benefit) of $1,319, $(402), $2,441, and $(1,810), respectively	4,962	(1,512)	9,181	(6,808)
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 $4, $(4), $8, and $9, respectively	16	(15)	32	31
Total other comprehensive income (loss)	4,978	(1,527)	9,213	(6,777)
Total comprehensive income	$ 20,763	$ 13,161	$ 35,675	$ 23,197