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Component: (Network and Table)
Network
2416402 - Disclosure - Comprehensive Income/(Loss) (Details)
(http://www.brooklinebank.com/role/ComprehensiveIncomeLossDetails)
TableAccumulated Other Comprehensive Income (Loss) [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001049782 (http://www.sec.gov/CIK)
Accumulated Other Comprehensive Income (Loss) [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Equity Components [Axis]Equity Components [Axis]Equity Components [Axis]
Investment Securities Available-for-SalePostretirement BenefitsEquity Component [Domain]Investment Securities Available-for-SalePostretirement BenefitsEquity Component [Domain]Investment Securities Available-for-SalePostretirement BenefitsEquity Component [Domain]
Changes in accumulated other comprehensive (loss) income by component, net of tax
 
 
 
 
 
 
 
 
 
Balance at the beginning of the period
(2,827,000) 
351,000  
(2,476,000) 
(1,733,000) 
111,000  
(1,622,000) 
(8,332,000) 
417,000  
(7,915,000) 
Other comprehensive (loss) income
(1,386,000) 
44,000  
(1,342,000) 
(1,094,000) 
240,000  
(854,000) 
6,599,000  
(306,000) 
6,293,000  
Balance at the end of the period
(4,213,000) 
 
395,000  
 
(3,818,000) 
 
(2,827,000) 
 
351,000  
 
(2,476,000) 
 
(1,733,000) 
 
111,000  
 
(1,622,000)