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Parent-Only Financial Information (Condensed Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
ASSETS: |  |  |  |
Interest-earning deposits in other financial institutions | $ 45,891 | $ 103,407 |  |
Securities available-for-sale, at estimated fair value (encumbered $197,896 in 2013 and $254,190 in 2012) | 937,085 | 1,275,631 |  |
Accrued interest receivable | 8,137 | 8,154 |  |
Other assets | 37,916 | 19,347 |  |
Total assets | 2,702,764 | 2,813,201 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY: |  |  |  |
Total liabilities | 1,986,656 | 2,398,328 |  |
Total stockholders' equity | 716,108 | 414,873 | 382,650 | 396,717
Total liabilities and stockholders' equity | 2,702,764 | 2,813,201 |  |
Parent Company |  |  |  |
ASSETS: |  |  |  |
Cash in Northfield Bank | 141,331 | 7,541 |  |
Interest-earning deposits in other financial institutions | 224 |  |  |
Investment in Northfield Bank | 547,216 | 386,324 |  |
Securities available-for-sale, at estimated fair value (encumbered $197,896 in 2013 and $254,190 in 2012) |  | 5,173 |  |
ESOP loan receivable | 27,799 | 14,525 |  |
Accrued interest receivable |  | 94 |  |
Other assets | 80 | 2,015 |  |
Total assets | 716,650 | 415,672 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY: |  |  |  |
Total liabilities | 542 | 799 |  |
Total stockholders' equity | 716,108 | 414,873 |  |
Total liabilities and stockholders' equity | $ 716,650 | $ 415,672 |  |

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