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Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2025
Regulatory Capital Requirements Under Banking Regulations [Abstract]  
Schedule of Actual and Required Capital Ratios The following table presents actual and required capital ratios as of December 31, 2025 for the Company and the Bank.
 ActualMinimum Required for Capital Adequacy
Purposes		Minimum Required for Fully Phased in Capital Adequacy Purposes plus Capital Conservation BufferMinimum Required to be Considered
 “Well-Capitalized” Under Prompt Corrective Action Provisions
 AmountRatioAmountRatioAmountRatioAmountRatio
 (Dollars in Thousands)
At December 31, 2025:      
Beacon Financial Corporation      
Common equity Tier 1 capital ratio (1)
$2,021,589 10.95 %$830,790 4.50 %$1,292,340 7.00 %N/AN/A
Tier 1 leverage capital ratio (2)
2,051,965 9.25 %887,336 4.00 %887,336 4.00 %N/AN/A
Tier 1 risk-based capital ratio (3)
2,051,965 11.12 %1,107,175 6.00 %1,568,498 8.50 %N/AN/A
Total risk-based capital ratio (4)
2,400,786 13.01 %1,476,271 8.00 %1,937,606 10.50 %N/AN/A
Beacon Bank & Trust      
Common equity Tier 1 capital ratio (1)
$2,069,767 11.22 %$830,120 4.50 %$1,291,298 7.00 %$1,199,063 6.50 %
Tier 1 leverage capital ratio (2)
2,069,767 9.39 %881,690 4.00 %881,690 4.00 %1,102,112 5.00 %
Tier 1 risk-based capital ratio (3)
2,069,767 11.22 %1,106,827 6.00 %1,568,005 8.50 %1,475,770 8.00 %
Total risk-based capital ratio (4)
2,280,038 12.36 %1,475,753 8.00 %1,936,925 10.50 %1,844,691 10.00 %
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(1) Common equity Tier 1 capital ratio is calculated by dividing common equity Tier 1 capital by risk-weighted assets.
(2) Tier 1 leverage capital ratio is calculated by dividing Tier 1 capital by average assets.
(3) Tier 1 risk-based capital ratio is calculated by dividing Tier 1 capital by risk-weighted assets.
(4) Total risk-based capital ratio is calculated by dividing total capital by risk-weighted assets.
The following table presents actual and required capital ratios as of December 31, 2024 for the Company and the former bank subsidiaries under the regulatory capital rules then in effect.
ActualMinimum Required for Capital Adequacy
Purposes		Minimum Required for Fully Phased in Capital Adequacy Purposes plus Capital Conservation BufferMinimum Required to be Considered
 “Well-Capitalized” Under Prompt Corrective Action Provisions
AmountRatioAmountRatioAmountRatioAmountRatio
(Dollars in Thousands)
At December 31, 2024:      
Brookline Bancorp, Inc.      
Common equity Tier 1 capital ratio (1)
$1,022,454 10.46 %$439,870 4.50 %$684,243 7.00 %N/AN/A
Tier 1 leverage capital ratio (2)
1,032,255 9.06 %455,742 4.00 %455,742 4.00 %N/AN/A
Tier 1 risk-based capital ratio (3)
1,032,255 10.56 %586,509 6.00 %830,887 8.50 %N/AN/A
Total risk-based capital ratio (4)
1,214,208 12.42 %782,099 8.00 %1,026,504 10.50 %N/AN/A
Brookline Bank      
Common equity Tier 1 capital ratio (1)
$584,420 10.47 %$251,183 4.50 %$390,730 7.00 %$362,820 6.50 %
Tier 1 leverage capital ratio (2)
584,420 9.30 %251,363 4.00 %251,363 4.00 %314,204 5.00 %
Tier 1 risk-based capital ratio (3)
584,420 10.47 %334,911 6.00 %474,457 8.50 %446,548 8.00 %
Total risk-based capital ratio (4)
654,287 11.73 %446,232 8.00 %585,679 10.50 %557,789 10.00 %
BankRI
Common equity Tier 1 capital ratio (1)
$294,573 10.53 %$125,886 4.50 %$195,823 7.00 %$181,835 6.50 %
Tier 1 leverage capital ratio (2)
294,573 8.90 %132,392 4.00 %132,392 4.00 %165,490 5.00 %
Tier 1 risk-based capital ratio (3)
294,573 10.53 %167,848 6.00 %237,784 8.50 %223,797 8.00 %
Total risk-based capital ratio (4)
328,646 11.75 %223,759 8.00 %293,684 10.50 %279,699 10.00 %
PCSB
Common equity Tier 1 capital ratio (1)
197,296 13.73 %64,664 4.50 %100,588 7.00 %93,403 6.50 %
Tier 1 leverage capital ratio (2)
197,296 10.11 %78,060 4.00 %78,060 4.00 %97,575 5.00 %
Tier 1 risk-based capital ratio (3)
197,296 13.73 %86,218 6.00 %122,142 8.50 %114,958 8.00 %
Total risk-based capital ratio (4)
214,879 14.95 %114,985 8.00 %150,918 10.50 %143,732 10.00 %
_______________________________________________________________________________
(1) Common equity Tier 1 capital ratio is calculated by dividing common equity Tier 1 capital by risk-weighted assets.
(2) Tier 1 leverage capital ratio is calculated by dividing Tier 1 capital by average assets.
(3) Tier 1 risk-based capital ratio is calculated by dividing Tier 1 capital by risk-weighted assets.
(4) Total risk-based capital ratio is calculated by dividing total capital by risk-weighted assets.