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Business Combination (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Oct. 14, 2011
New Jersey State-chartered bank
Oct. 14, 2011
New Jersey State-chartered bank
Deposits [Member]
Nov. 02, 2011
Flatbush Federal
Nov. 02, 2011
Flatbush Federal
Deposits [Member]
Business Acquisition [Line Items]              
Business acquisition assumed amount       $ 188,600,000 $ 188,300,000 $ 119,200,000 $ 110,600,000
Business acquisition, assets acquired       185,000,000   136,600,000  
Business acquired, loans       132,800,000   81,900,000  
SBA loan, not acquired   10,162,000 14,786,000 5,600,000      
Other loans   2,310,000 1,830,000 5,900,000      
Bargain purchase gain, net of tax 3,560,000            
Shares of Northfield Bancorp common stock for each share of Flatbush Federal Bancorp common stock owned           $ 0.4748  
Shareholders ownership in the combined company           3.10%  
Business acquired, securities           32,700,000  
Business acquisition, equity           $ 17,500,000