Consolidated Statements of Comprehensive Income - Unaudited - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income attributable to Bryn Mawr Bank Corporation	$ 10,677	$ 15,286
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 $1,121 and $(1,319), respectively	4,219	(4,961)
Reclassification adjustment for net (gain) on sale realized in net income, net of tax expense of $0 and $1, respectively	0	(6)
Reclassification adjustment for net (gain) realized on transfer of investment securities available for sale to trading, net of tax expense of $0 and $88, respectively	0	(329)
Unrealized investment gains (losses), net of tax expense (benefit) of $1,121 and $(1,408), respectively	4,219	(5,296)
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 of $4 and $12, respectively	16	46
Total other comprehensive income (loss)	4,235	(5,250)
Total comprehensive income	$ 14,912	$ 10,036