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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

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