Consolidated Statements of Comprehensive Income - Unaudited - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income attributable to Bryn Mawr Bank Corporation	$ 21,342	$ 15,035	$ 38,425	$ 3,872
Net change in unrealized (losses) gains on investment securities available for sale:
Unrealized investment gains (losses), net of tax expense (benefit) of $275, $34, $(1,035), and $1,804, respectively	1,034	127	(3,896)	6,786
Net change in unrealized losses on interest rate swaps used in cash flow hedges:
Net unrealized gains arising during the period, net of tax expense of $1,039, $0, $37, and $0, respectively	3,909	0	140	0
Reclassification adjustment for gains included in net income, net of tax expense of $87, $0, $126, and $0, respectively	(326)	0	(473)	0
Net unrealized gains (losses) on interest rate swaps used in cash flow hedges, net of tax expense (benefit) of $952, $0, $(89), and $0, respectively	3,583	0	(333)	0
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 $8, $6, $22, and $12, respectively	27	23	79	46
Total other comprehensive income (loss)	4,644	150	(4,150)	6,832
Total comprehensive income	$ 25,986	$ 15,185	$ 34,275	$ 10,704