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Regulatory Capital Requirements (Tables) | 12 Months Ended
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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.
|  | Actual |  | Minimum Required for Capital Adequacy Purposes |  | Minimum Required for Fully Phased in Capital Adequacy Purposes plus Capital Conservation Buffer |  | Minimum Required to be Considered “Well-Capitalized” Under Prompt Corrective Action Provisions
|  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
|  | (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/A |  | N/A
Tier 1 leverage capital ratio (2) |  | 2,051,965 |  |  | 9.25 | % |  | 887,336 |  |  | 4.00 | % |  | 887,336 |  |  | 4.00 | % |  | N/A |  | N/A
Tier 1 risk-based capital ratio (3) |  | 2,051,965 |  |  | 11.12 | % |  | 1,107,175 |  |  | 6.00 | % |  | 1,568,498 |  |  | 8.50 | % |  | N/A |  | N/A
Total risk-based capital ratio (4) |  | 2,400,786 |  |  | 13.01 | % |  | 1,476,271 |  |  | 8.00 | % |  | 1,937,606 |  |  | 10.50 | % |  | N/A |  | N/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 | %
_______________________________________________________________________________ (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.
|  | Actual |  | Minimum Required for Capital Adequacy Purposes |  | Minimum Required for Fully Phased in Capital Adequacy Purposes plus Capital Conservation Buffer |  | Minimum Required to be Considered “Well-Capitalized” Under Prompt Corrective Action Provisions
|  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
|  | (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/A |  | N/A
Tier 1 leverage capital ratio (2) |  | 1,032,255 |  |  | 9.06 | % |  | 455,742 |  |  | 4.00 | % |  | 455,742 |  |  | 4.00 | % |  | N/A |  | N/A
Tier 1 risk-based capital ratio (3) |  | 1,032,255 |  |  | 10.56 | % |  | 586,509 |  |  | 6.00 | % |  | 830,887 |  |  | 8.50 | % |  | N/A |  | N/A
Total risk-based capital ratio (4) |  | 1,214,208 |  |  | 12.42 | % |  | 782,099 |  |  | 8.00 | % |  | 1,026,504 |  |  | 10.50 | % |  | N/A |  | N/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.

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- Definition Regulatory Capital Requirements Under Banking Regulations + References No definition available. + Details
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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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