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Parent-Only Financial Information (Condensed Statements Of Income And Other Comprehensive (Loss) Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income tax (benefit) expense $ (2,940) $ (2,682) $ (2,528) $ (2,586) $ (1,786) $ (2,285) $ (2,150) $ (2,695) $ (10,736) $ (8,916) $ (6,497)
Net income 4,956 5,100 4,299 4,792 3,241 3,894 3,948 4,948 19,147 16,031 16,823
Other comprehensive (loss) income, net of tax                 (22,881) 761 6,560
Comprehensive (loss) income                 (3,734) 16,792 23,383
Parent Company
                      
Interest on ESOP loan                 904 490 500
Interest income on deposit in Northfield Bank                 286 18 78
Interest income on deposits in other financial institutions                     3
Interest income on corporate bonds                 13 157 688
Gain on securities transactions, net                     227
Undistributed earnings of Northfield Bank                 19,157 16,360 16,503
Total income                 20,360 17,025 17,999
Other expenses                 1,188 1,249 952
Income tax (benefit) expense                 25 (255) 224
Total expense                 1,213 994 1,176
Net income                 19,147 16,031 16,823
Other comprehensive (loss) income, net of tax                 (22,881) 761 6,560
Comprehensive (loss) income                 $ (3,734) $ 16,792 $ 23,383