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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Pay vs Performance Disclosure          
Pay vs Performance Disclosure, Table
​ ​ ​ ​
Summary
Compensation
Table For
PEO’s
​ ​
Compensation
Actually Paid
to PEO (2)
​ ​
Average
Summary
Compensation
Table Total for
Non-PEO NEOs
​ ​
Average
Compensation
Actually Paid to
NON-PEO NEOs (2)
​ ​
Total
Shareholder
Return (TSR) (3)
​ ​
TSR of Peer
Group (3,4)
​ ​
Net
Income
​ ​
Company
Selected
Measure – 
Return on
Average
Tangible
Common
Equity (5)
​
​
Year(1)
​ ​
$(000s)
​ ​
$(000s)
​ ​
$(000s)
​ ​
$(000s)
​ ​
$
​ ​
$
​ ​
$(000s)
​ ​ ​ ​ ​ ​ ​
​
2024
​ ​ ​ ​ 1,378 ​ ​ ​ ​ ​ 1,353 ​ ​ ​ ​ ​ 457 ​ ​ ​ ​ ​ 449 ​ ​ ​ ​ ​ 116.01 ​ ​ ​ ​ ​ 121.75 ​ ​ ​ ​ ​ 27,045 ​ ​ ​ ​ ​ 12.35% ​ ​
​
2023
​ ​ ​ ​ 1,256 ​ ​ ​ ​ ​ 1,191 ​ ​ ​ ​ ​ 421 ​ ​ ​ ​ ​ 412 ​ ​ ​ ​ ​ 113.17 ​ ​ ​ ​ ​ 108.08 ​ ​ ​ ​ ​ 29,519 ​ ​ ​ ​ ​ 14.58% ​ ​
​
2022
​ ​ ​ ​ 1,192 ​ ​ ​ ​ ​ 1,143 ​ ​ ​ ​ ​ 422 ​ ​ ​ ​ ​ 401 ​ ​ ​ ​ ​ 113.83 ​ ​ ​ ​ ​ 116.73 ​ ​ ​ ​ ​ 38,990 ​ ​ ​ ​ ​ 19.15% ​ ​
​
2021
​ ​ ​ ​ 1,148 ​ ​ ​ ​ ​ 1,305 ​ ​ ​ ​ ​ 398 ​ ​ ​ ​ ​ 419 ​ ​ ​ ​ ​ 114.32 ​ ​ ​ ​ ​ 116.64 ​ ​ ​ ​ ​ 36,269 ​ ​ ​ ​ ​ 17.64% ​ ​
​
2020
​ ​ ​ ​ 1,043 ​ ​ ​ ​ ​ 977 ​ ​ ​ ​ ​ 392 ​ ​ ​ ​ ​ 354 ​ ​ ​ ​ ​ 88.44 ​ ​ ​ ​ ​ 83.37 ​ ​ ​ ​ ​ 27,129 ​ ​ ​ ​ ​ 14.29% ​ ​
​
(1)
For each of the years presented above, our PEO was Tony C. McKim. In 2020 our other NEOs were Susan A. Norton, Richard M. Elder, Sarah J. Tolman, and Charles A. Wootton. In 2021, 2022, 2023 and 2024 our other NEOs were Susan A. Norton, Richard M. Elder, Sarah J. Tolman and Jonathan W. Nicholson.
​
(2)
The table below details amounts deducted and added to calculate Average Compensation Actually Paid to the PEO and non-PEO NEOs.
​
(3)
TSR is calculated based on a fixed investment of $100 made at the closing price as of December 31, 2019, for the period ending December 31 of each year in the table above, assuming reinvestment of all cash dividends and retention of all stock dividends.
​
(4)
Peer group as defined on Page 25 under Compensation Benchmarking. Peer group TSR is a weighted average based upon market capitalization. To smooth out potential aberrations, peer companies with the highest and lowest TSR have been removed from each year's calculation. In 2024 Cambridge Bancorp and Codorus Valley Bancorp, Inc. were acquired. They were replaced in the peer group by Peoples Financial Services Corp. and Fidelity D&D Bancorp, Inc.
​
(5)
Return on Average Tangible Equity calculation is Net Income divided by Average Tangible Equity. See Appendix A for further detail.
​
​ ​ ​ ​
2020
​ ​
2021
​ ​
2022
​ ​
2023
​ ​
2024
​
​
Reconciliation of Compensation
Actually Paid
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​
​
Total Compensation per Summary
Compensation Table (SCT)
​ ​ ​ ​ 1,043 ​ ​ ​ ​ ​ 392 ​ ​ ​ ​ ​ 1,148 ​ ​ ​ ​ ​ 398 ​ ​ ​ ​ ​ 1,192 ​ ​ ​ ​ ​ 422 ​ ​ ​ ​ ​ 1,256 ​ ​ ​ ​ ​ 421 ​ ​ ​ ​ ​ 1,378 ​ ​ ​ ​ ​ 457 ​ ​
​ Less: Value of Stock Grants reported in SCT ​ ​ ​ ​ (204) ​ ​ ​ ​ ​ (52) ​ ​ ​ ​ ​ (183) ​ ​ ​ ​ ​ (49) ​ ​ ​ ​ ​ (201) ​ ​ ​ ​ ​ (60) ​ ​ ​ ​ ​ (233) ​ ​ ​ ​ ​ (59) ​ ​ ​ ​ ​ (244) ​ ​ ​ ​ ​ (62) ​ ​
​ Plus: Year-End Value of Stock
Grants Awarded in Fiscal Year that
are Unvested and Outstanding 		​ ​ ​ ​ 179 ​ ​ ​ ​ ​ 39 ​ ​ ​ ​ ​ 269 ​ ​ ​ ​ ​ 54 ​ ​ ​ ​ ​ 168 ​ ​ ​ ​ ​ 45 ​ ​ ​ ​ ​ 194 ​ ​ ​ ​ ​ 58 ​ ​ ​ ​ ​ 243 ​ ​ ​ ​ ​ 61 ​ ​
​
Plus: Change in Fair Value of Prior
Year Awards that are Unvested and
Outstanding
​ ​ ​ ​ (41) ​ ​ ​ ​ ​ (24) ​ ​ ​ ​ ​ 63 ​ ​ ​ ​ ​ 26 ​ ​ ​ ​ ​ (18) ​ ​ ​ ​ ​ (6) ​ ​ ​ ​ ​ (22) ​ ​ ​ ​ ​ (6) ​ ​ ​ ​ ​ (11) ​ ​ ​ ​ ​ (3) ​ ​
​ Plus: Change in Fair Value of Prior
Year Awards that Vested this Year 		​ ​ ​ ​ — ​ ​ ​ ​ ​ (1) ​ ​ ​ ​ ​ 7 ​ ​ ​ ​ ​ (11) ​ ​ ​ ​ ​ 3 ​ ​ ​ ​ ​ 2 ​ ​ ​ ​ ​ (4) ​ ​ ​ ​ ​ (3) ​ ​ ​ ​ ​ (13) ​ ​ ​ ​ ​ (3) ​ ​
​ “Compensation Actually Paid” for Year Shown ​ ​ ​ ​ 977 ​ ​ ​ ​ ​ 354 ​ ​ ​ ​ ​ 1,305 ​ ​ ​ ​ ​ 419 ​ ​ ​ ​ ​ 1,143 ​ ​ ​ ​ ​ 401 ​ ​ ​ ​ ​ 1,191 ​ ​ ​ ​ ​ 412 ​ ​ ​ ​ ​ 1,353 ​ ​ ​ ​ ​ 449 ​ ​
       
Company Selected Measure Name Return on Average Tangible Equity        
Named Executive Officers, Footnote
(1)
For each of the years presented above, our PEO was Tony C. McKim. In 2020 our other NEOs were Susan A. Norton, Richard M. Elder, Sarah J. Tolman, and Charles A. Wootton. In 2021, 2022, 2023 and 2024 our other NEOs were Susan A. Norton, Richard M. Elder, Sarah J. Tolman and Jonathan W. Nicholson.
       
Peer Group Issuers, Footnote
(3)
TSR is calculated based on a fixed investment of $100 made at the closing price as of December 31, 2019, for the period ending December 31 of each year in the table above, assuming reinvestment of all cash dividends and retention of all stock dividends.
​
(4)
Peer group as defined on Page 25 under Compensation Benchmarking. Peer group TSR is a weighted average based upon market capitalization. To smooth out potential aberrations, peer companies with the highest and lowest TSR have been removed from each year's calculation. In 2024 Cambridge Bancorp and Codorus Valley Bancorp, Inc. were acquired. They were replaced in the peer group by Peoples Financial Services Corp. and Fidelity D&D Bancorp, Inc.
       
PEO Total Compensation Amount $ 1,378,000 $ 1,256,000 $ 1,192,000 $ 1,148,000 $ 1,043,000
PEO Actually Paid Compensation Amount $ 1,353,000 1,191,000 1,143,000 1,305,000 977,000
Adjustment To PEO Compensation, Footnote
​ ​ ​ ​
2020
​ ​
2021
​ ​
2022
​ ​
2023
​ ​
2024
​
​
Reconciliation of Compensation
Actually Paid
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​
​
Total Compensation per Summary
Compensation Table (SCT)
​ ​ ​ ​ 1,043 ​ ​ ​ ​ ​ 392 ​ ​ ​ ​ ​ 1,148 ​ ​ ​ ​ ​ 398 ​ ​ ​ ​ ​ 1,192 ​ ​ ​ ​ ​ 422 ​ ​ ​ ​ ​ 1,256 ​ ​ ​ ​ ​ 421 ​ ​ ​ ​ ​ 1,378 ​ ​ ​ ​ ​ 457 ​ ​
​ Less: Value of Stock Grants reported in SCT ​ ​ ​ ​ (204) ​ ​ ​ ​ ​ (52) ​ ​ ​ ​ ​ (183) ​ ​ ​ ​ ​ (49) ​ ​ ​ ​ ​ (201) ​ ​ ​ ​ ​ (60) ​ ​ ​ ​ ​ (233) ​ ​ ​ ​ ​ (59) ​ ​ ​ ​ ​ (244) ​ ​ ​ ​ ​ (62) ​ ​
​ Plus: Year-End Value of Stock
Grants Awarded in Fiscal Year that
are Unvested and Outstanding 		​ ​ ​ ​ 179 ​ ​ ​ ​ ​ 39 ​ ​ ​ ​ ​ 269 ​ ​ ​ ​ ​ 54 ​ ​ ​ ​ ​ 168 ​ ​ ​ ​ ​ 45 ​ ​ ​ ​ ​ 194 ​ ​ ​ ​ ​ 58 ​ ​ ​ ​ ​ 243 ​ ​ ​ ​ ​ 61 ​ ​
​
Plus: Change in Fair Value of Prior
Year Awards that are Unvested and
Outstanding
​ ​ ​ ​ (41) ​ ​ ​ ​ ​ (24) ​ ​ ​ ​ ​ 63 ​ ​ ​ ​ ​ 26 ​ ​ ​ ​ ​ (18) ​ ​ ​ ​ ​ (6) ​ ​ ​ ​ ​ (22) ​ ​ ​ ​ ​ (6) ​ ​ ​ ​ ​ (11) ​ ​ ​ ​ ​ (3) ​ ​
​ Plus: Change in Fair Value of Prior
Year Awards that Vested this Year 		​ ​ ​ ​ — ​ ​ ​ ​ ​ (1) ​ ​ ​ ​ ​ 7 ​ ​ ​ ​ ​ (11) ​ ​ ​ ​ ​ 3 ​ ​ ​ ​ ​ 2 ​ ​ ​ ​ ​ (4) ​ ​ ​ ​ ​ (3) ​ ​ ​ ​ ​ (13) ​ ​ ​ ​ ​ (3) ​ ​
​ “Compensation Actually Paid” for Year Shown ​ ​ ​ ​ 977 ​ ​ ​ ​ ​ 354 ​ ​ ​ ​ ​ 1,305 ​ ​ ​ ​ ​ 419 ​ ​ ​ ​ ​ 1,143 ​ ​ ​ ​ ​ 401 ​ ​ ​ ​ ​ 1,191 ​ ​ ​ ​ ​ 412 ​ ​ ​ ​ ​ 1,353 ​ ​ ​ ​ ​ 449 ​ ​
       
Non-PEO NEO Average Total Compensation Amount $ 457,000 421,000 422,000 398,000 392,000
Non-PEO NEO Average Compensation Actually Paid Amount $ 449,000 412,000 401,000 419,000 354,000
Adjustment to Non-PEO NEO Compensation Footnote
​ ​ ​ ​
2020
​ ​
2021
​ ​
2022
​ ​
2023
​ ​
2024
​
​
Reconciliation of Compensation
Actually Paid
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​ ​
PEO
$(000s)
​ ​
Average of
Non-PEO
NEOs
$(000s)
​
​
Total Compensation per Summary
Compensation Table (SCT)
​ ​ ​ ​ 1,043 ​ ​ ​ ​ ​ 392 ​ ​ ​ ​ ​ 1,148 ​ ​ ​ ​ ​ 398 ​ ​ ​ ​ ​ 1,192 ​ ​ ​ ​ ​ 422 ​ ​ ​ ​ ​ 1,256 ​ ​ ​ ​ ​ 421 ​ ​ ​ ​ ​ 1,378 ​ ​ ​ ​ ​ 457 ​ ​
​ Less: Value of Stock Grants reported in SCT ​ ​ ​ ​ (204) ​ ​ ​ ​ ​ (52) ​ ​ ​ ​ ​ (183) ​ ​ ​ ​ ​ (49) ​ ​ ​ ​ ​ (201) ​ ​ ​ ​ ​ (60) ​ ​ ​ ​ ​ (233) ​ ​ ​ ​ ​ (59) ​ ​ ​ ​ ​ (244) ​ ​ ​ ​ ​ (62) ​ ​
​ Plus: Year-End Value of Stock
Grants Awarded in Fiscal Year that
are Unvested and Outstanding 		​ ​ ​ ​ 179 ​ ​ ​ ​ ​ 39 ​ ​ ​ ​ ​ 269 ​ ​ ​ ​ ​ 54 ​ ​ ​ ​ ​ 168 ​ ​ ​ ​ ​ 45 ​ ​ ​ ​ ​ 194 ​ ​ ​ ​ ​ 58 ​ ​ ​ ​ ​ 243 ​ ​ ​ ​ ​ 61 ​ ​
​
Plus: Change in Fair Value of Prior
Year Awards that are Unvested and
Outstanding
​ ​ ​ ​ (41) ​ ​ ​ ​ ​ (24) ​ ​ ​ ​ ​ 63 ​ ​ ​ ​ ​ 26 ​ ​ ​ ​ ​ (18) ​ ​ ​ ​ ​ (6) ​ ​ ​ ​ ​ (22) ​ ​ ​ ​ ​ (6) ​ ​ ​ ​ ​ (11) ​ ​ ​ ​ ​ (3) ​ ​
​ Plus: Change in Fair Value of Prior
Year Awards that Vested this Year 		​ ​ ​ ​ — ​ ​ ​ ​ ​ (1) ​ ​ ​ ​ ​ 7 ​ ​ ​ ​ ​ (11) ​ ​ ​ ​ ​ 3 ​ ​ ​ ​ ​ 2 ​ ​ ​ ​ ​ (4) ​ ​ ​ ​ ​ (3) ​ ​ ​ ​ ​ (13) ​ ​ ​ ​ ​ (3) ​ ​
​ “Compensation Actually Paid” for Year Shown ​ ​ ​ ​ 977 ​ ​ ​ ​ ​ 354 ​ ​ ​ ​ ​ 1,305 ​ ​ ​ ​ ​ 419 ​ ​ ​ ​ ​ 1,143 ​ ​ ​ ​ ​ 401 ​ ​ ​ ​ ​ 1,191 ​ ​ ​ ​ ​ 412 ​ ​ ​ ​ ​ 1,353 ​ ​ ​ ​ ​ 449 ​ ​
       
Compensation Actually Paid vs. Total Shareholder Return [MISSING IMAGE: bc_companytsr-pn.jpg]        
Compensation Actually Paid vs. Net Income
[MISSING IMAGE: bc_netincome-pn.jpg]
       
Compensation Actually Paid vs. Company Selected Measure
[MISSING IMAGE: bc_equity-pn.jpg]
       
Total Shareholder Return Vs Peer Group [MISSING IMAGE: bc_companytsr-pn.jpg]        
Tabular List, Table
Tabular List of Financial Performance Measures
The performance measures below were used for the year ended 2024 and represent the most important financial measures used by the Company to link compensation paid to the NEOs, including the PEO, during the most recent fiscal year
to the Company’s performance. The following unranked list of Financial Performance Measures applies to each NEO, including the PEO:
​
Return on Average Tangible Common Equity
Total Shareholder Return
Net Income
Efficiency Ratio
For further information regarding our compensation philosophy and how our executive compensation aligns with performance, refer to the discussion under “Compensation Discussion and Analysis” beginning on page 22
       
Total Shareholder Return Amount $ 116.01 113.17 113.83 114.32 88.44
Peer Group Total Shareholder Return Amount 121.75 108.08 116.73 116.64 83.37
Net Income (Loss) $ 27,045,000 $ 29,519,000 $ 38,990,000 $ 36,269,000 $ 27,129,000
Company Selected Measure Amount 12.35 14.58 19.15 17.64 14.29
PEO Name Tony C. McKim        
Measure:: 1          
Pay vs Performance Disclosure          
Name Return on Average Tangible Common Equity        
Non-GAAP Measure Description
(5)
Return on Average Tangible Equity calculation is Net Income divided by Average Tangible Equity. See Appendix A for further detail.
       
Measure:: 2          
Pay vs Performance Disclosure          
Name Total Shareholder Return        
Measure:: 3          
Pay vs Performance Disclosure          
Name Net Income        
Measure:: 4          
Pay vs Performance Disclosure          
Name Efficiency Ratio        
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ (244,000) $ (233,000) $ (201,000) $ (183,000) $ (204,000)
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 243,000 194,000 168,000 269,000 179,000
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (11,000) (22,000) (18,000) 63,000 (41,000)
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (13,000) (4,000) 3,000 7,000
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (62,000) (59,000) (60,000) (49,000) (52,000)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 61,000 58,000 45,000 54,000 39,000
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (3,000) (6,000) (6,000) 26,000 (24,000)
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ (3,000) $ (3,000) $ 2,000 $ (11,000) $ (1,000)