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Business Combinations - Business Combination, Consideration Transferred (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 01, 2025	Aug. 31, 2025
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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