Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities:
Net income attributable to Bryn Mawr Bank Corporation	$ 32,573	$ 59,206	$ 63,792
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	41,677	8,595	7,089
Depreciation of premises and equipment	7,805	7,801	6,610
Net gain on sale of long-lived assets	(2,297)	0	0
Non-cash operating lease expense	3,224	3,647	0
Loss on disposal of premises and equipment	825	69	1,627
Impairment of long-lived assets	1,605	0	0
Net amortization of investment premiums and discounts	5,128	2,800	3,044
Net gain on sale of investment securities available for sale	0	0	(7)
Net gain on sale of loans	(5,779)	(2,342)	(3,283)
Stock-based compensation	3,044	3,725	2,750
Amortization and net impairment of mortgage servicing rights	1,824	597	830
Net accretion of fair value adjustments	(3,707)	(6,088)	(9,883)
Amortization of intangible assets	3,567	3,801	3,656
Impairment of other real estate owned ("OREO") and other repossessed assets	0	0	89
Net (gain) loss on sale of OREO	(148)	84	(295)
Net increase in cash surrender value of bank owned life insurance ("BOLI")	(1,314)	(1,235)	(1,177)
Other, net	786	(475)	532
Loans originated for resale	(106,252)	(90,865)	(86,323)
Proceeds from loans sold	107,568	93,459	91,353
Provision for deferred income taxes	(3,678)	1,539	9,839
Change in income taxes payable/receivable	340	5,897	415
Change in accrued interest receivable	(3,022)	103	1,661
Change in accrued interest payable	29	(404)	3,125
Change in operating lease liabilities	(3,156)	(3,525)	0
Change in other assets	(71,910)	(33,018)	(19,222)
Change in other liabilities	62,544	40,010	3,013
Net cash provided by operating activities	71,276	93,381	79,235
Investing activities:
Purchases of investment securities available for sale	(894,815)	(719,700)	(338,421)
Purchases of investment securities held to maturity	(5,372)	(4,868)	(1,328)
Proceeds from maturity and paydowns of investment securities available for sale	632,015	293,987	278,895
Proceeds from maturity and paydowns of investment securities held to maturity	3,023	891	532
Proceeds from sale of investment securities available for sale	0	0	7
Net change in FHLB stock	11,078	(9,214)	5,553
Proceeds from calls of investment securities	97,775	167,290	810
Net change in other investments	(1,059)	(157)	(4,056)
Purchase of customer relationships	0	(18)	(366)
Purchase of portfolio loans and leases	0	0	(14,974)
Net portfolio loan and lease originations	(250,163)	(264,822)	(127,589)
Proceeds from portfolio loans sold	305,313	0	0
Purchases of premises and equipment	(1,348)	(7,187)	(19,426)
Proceeds from the sale of long-lived assets	3,166	0	0
Acquisitions, net of cash acquired	0	0	(380)
Proceeds from sale of OREO	534	418	525
Net cash used in investing activities	(99,853)	(543,380)	(220,218)
Financing activities:
Change in deposits	534,404	243,836	226,598
Change in short-term borrowings	(421,058)
Change in short-term borrowings		240,852	14,502
Dividends paid	(21,356)	(20,685)	(19,289)
Change in long-term FHLB advances and other borrowings	(12,501)	(3,240)	(83,872)
Payment of contingent consideration for business combinations	(507)	(875)	(660)
Cash payments to taxing authorities on employees' behalf from shares withheld from stock-based compensation	(633)	(625)	(1,639)
Net proceeds from sale of (purchase of) treasury stock for deferred compensation plans	(153)	(172)	2
Repurchase of warrants from U.S. Treasury	0	0	(1,755)
Net purchase of treasury stock through publicly announced plans	(7,249)	(4,524)	(5,936)
Proceeds from exercise of stock options	12	907	1,464
Net cash provided by financing activities	70,959	455,474	129,415
Change in cash and cash equivalents	42,382	5,475	(11,568)
Cash and cash equivalents at beginning of period	53,931	48,456	60,024
Cash and cash equivalents at end of period	96,313	53,931	48,456
Supplemental cash flow information:
Income taxes	12,203	12,716	3,449
Interest	23,865	46,152	28,453
Non-cash information:
Change in other comprehensive income (loss)	6,761	9,700	(3,099)
Change in deferred tax due to change in comprehensive income	1,797	2,578	(823)
Transfer of loans to other real estate owned and repossessed assets	386	72	372
Acquisition of noncash assets and liabilities:
Assets acquired	0	0	1,096
Liabilities assumed	$ 0	$ 0	$ 687