Name:	bmtc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferredShares
Namespace Prefix:	bmtc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

This element represents the amount of any measurement period adjustment (As defined) Realized during the reporting period to deferred income taxes assumed in connection with a business combination for which the initial accounting was incomplete.

No definition available.

Name:	bmtc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredIncomeTaxes
Namespace Prefix:	bmtc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to loans acquired in connection with a business combination for which the initial accounting was incomplete.

No definition available.

Name:	bmtc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLoans
Namespace Prefix:	bmtc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to other assets acquired in connection with a business combination for which the initial accounting was incomplete.

No definition available.

Name:	bmtc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssets
Namespace Prefix:	bmtc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents the amount of total measurement period adjustments (as defined) realized during the reporting period for items acquired in connection with a business combination for which the initial accounting was incomplete.

No definition available.

Name:	bmtc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTotal
Namespace Prefix:	bmtc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 4A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472

Name:	us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.