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Component: (Network and Table)
Network
121 - Disclosure - Note 16 - Pension and Postretirement Benefit Plans - Actuarial Assumptions Used to Determine Benefit Obligations (Details)
(http://www.bmtc.com/20161231/role/statement-note-16-pension-and-postretirement-benefit-plans-actuarial-assumptions-used-to-determine-benefit-obligations-details)
TableStatement [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000802681 (http://www.sec.gov/CIK)
Scenario [Axis]Scenario, Unspecified [Domain]
Statement [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
QDBP [Member]SERP I and SERP II [Member]PRBP [Member]QDBP [Member]SERP I and SERP II [Member]PRBP [Member]
Discount rate
xsi:nil  
3.75%  
2.80%  
xsi:nil  
3.90%  
3.90%  
Rate of increase for future compensation
xsi:nil  
xsi:nil  
xsi:nil  
xsi:nil  
xsi:nil  
xsi:nil  
Expected long-term rate of return on plan assets
xsi:nil  
xsi:nil  
xsi:nil  
xsi:nil  
xsi:nil  
xsi:nil