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Acquisitions
 12 Months Ended
Dec. 31, 2019
Business Combinations [Abstract]  
Acquisitions Acquisitions
Eastern Funding, LLC Redemption of Non-Controlling Interest
On January 4, 2019, Brookline Bank, a wholly-owned subsidiary of the Company, completed the redemption of the remaining 15.93 percent interest in Eastern Funding, LLC, a subsidiary of Brookline Bank. Brookline Bank paid $35.9 million in cash consideration for the outstanding interest in Eastern Funding, LLC. Eastern Funding, LLC is now a wholly-owned subsidiary of Brookline Bank.