PARENT COMPANY FINANCIAL INFORMATION (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Parent company financial information      
Net Income $ 12,578 $ 14,179 $ 11,036
Unrealized gains (losses) on securities:      
Unrealized holding (losses) gains on available for sale securities arising during the period (net of deferred tax of $13,403, $44, and $7,075 for the years ended December 31, 2013, 2012, and 2011, respectively) (22,993) (115) 11,424
Reclassification adjustment for net gains on available for sale securities included in net income (net of tax of $459, $1,063, and $240 for the years ended December 31, 2013, 2012, and 2011, respectively) (788) (1,820) (411)
Defined benefit pension plans:      
Pension gains (losses), other postretirement and postemployment benefit plan adjustments (net of tax of $5,002, $1,684, and $6,857 for the years ended December 31, 2013, 2012, and 2011, respectively) 9,454 (3,930) (10,293)
Total other comprehensive (loss) income (14,327) (5,865) 720
Comprehensive (loss) income (1,749) 8,314 11,756
Beneficial Mutual Bancorp, Inc.
     
Parent company financial information      
Net Income 12,578 14,179 11,036
Unrealized gains (losses) on securities:      
Unrealized holding (losses) gains on available for sale securities arising during the period (net of deferred tax of $13,403, $44, and $7,075 for the years ended December 31, 2013, 2012, and 2011, respectively) (22,993) (115) 11,424
Reclassification adjustment for net gains on available for sale securities included in net income (net of tax of $459, $1,063, and $240 for the years ended December 31, 2013, 2012, and 2011, respectively) (788) (1,820) (411)
Defined benefit pension plans:      
Pension gains (losses), other postretirement and postemployment benefit plan adjustments (net of tax of $5,002, $1,684, and $6,857 for the years ended December 31, 2013, 2012, and 2011, respectively) 9,454 (3,930) (10,293)
Total other comprehensive (loss) income (14,327) (5,865) 720
Comprehensive (loss) income $ (1,749) $ 8,314 $ 11,756