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Business Combinations - Business Combination, Consideration Transferred (Details) - USD ($) $ / shares in Units, $ in Thousands | Sep. 01, 2025 | Aug. 31, 2025
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Business Combination [Line Items] |  |
Brookline market price (in USD per share) |  | $ 26.14
Brookline Bancorp, Inc. |  |
Business Combination [Line Items] |  |
Brookline market price (in USD per share) |  | $ 10.95
Holdco Merger |  |
Business Combination [Line Items] |  |
Value of consideration transferred, equity interest | $ 1,147 |
Cash paid for fractional shares | 49 |
Purchase price consideration | 1,210,647 |
Holdco Merger | Brookline Bancorp, Inc. |  |
Business Combination [Line Items] |  |
Number of hypothetical Brookline shares issued to Berkshire Stockholders (in shares) |  | 200,150,309
Value of consideration transferred, equity interest | $ 1,209,451 |
Company Stockholders | Holdco Merger | Brookline Bancorp, Inc. |  |
Business Combination [Line Items] |  |
Number of hypothetical Brookline shares issued to Berkshire Stockholders (in shares) | 110,452,183 | 110,452,183

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