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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events First Ipswich Bank On February 15, 2020, Brookline Bank completed the merger of First Ipswich Bank and its subsidiaries with and into Brookline Bank. First Ipswich was already a wholly-owned subsidiary of the Company, therefore there was no tax impact and minimal impact to customers. All of First Ipswich Bank's six branch locations were retained and converted to Brookline Bank branches. The Company has evaluated subsequent events other than the matters described above and through the date of issuance.