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Parent-only Financial Information (Tables) - Parent Company | 12 Months Ended
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Dec. 31, 2021
Condensed Balance Sheets | Northfield Bancorp, Inc. Condensed Balance Sheets
| December 31,
| 2021 |  | 2020
| (in thousands)
Assets |  |  |
Cash in Northfield Bank | $ | 14,411 |  |  | $ | 21,456 |
Interest-earning deposits in other financial institutions | — |  |  | 21 |
Investment in Northfield Bank | 703,036 |  |  | 711,441 |
ESOP loan receivable | 19,283 |  |  | 20,836 |
Other assets | 3,412 |  |  | 474 |
Total assets | $ | 740,142 |  |  | $ | 754,228 |
Liabilities and Stockholders' Equity |  |  |
Total liabilities | $ | 259 |  |  | $ | 247 |
Total stockholders' equity | 739,883 |  |  | 753,981 |
Total liabilities and stockholders' equity | $ | 740,142 |  |  | $ | 754,228 |
Condensed Statements of Comprehensive Income | Northfield Bancorp, Inc. Condensed Statements of Comprehensive Income
| Years Ended
| December 31,
| 2021 |  | 2020 |  | 2019
| (in thousands)
Interest on ESOP loan | $ | 677 |  |  | $ | 1,043 |  |  | $ | 1,263 |
Interest income on deposits in other financial institutions | 18 |  |  | 129 |  |  | 229 |
Gains on securities, net | — |  |  | — |  |  | 10 |
Undistributed earnings of Northfield Bank | 70,956 |  |  | 37,544 |  |  | 40,012 |
Total income | 71,651 |  |  | 38,716 |  |  | 41,514 |
Other expenses | 831 |  |  | 1,647 |  |  | 863 |
Income tax expense | 166 |  |  | 81 |  |  | 416 |
Total expenses | 997 |  |  | 1,728 |  |  | 1,279 |
Net income | $ | 70,654 |  |  | $ | 36,988 |  |  | $ | 40,235 |
Comprehensive income: |  |  |  |  |
Net income | $ | 70,654 |  |  | $ | 36,988 |  |  | $ | 40,235 |
Other comprehensive (loss) income, net of tax | (11,097) |  |  | 8,461 |  |  | 13,846 |
Comprehensive income | $ | 59,557 |  |  | $ | 45,449 |  |  | $ | 54,081 |
Condensed Statements of Cash Flows | Northfield Bancorp, Inc. Condensed Statements of Cash Flows
| December 31,
| 2021 |  | 2020 |  | 2019
| (in thousands)
Cash flows from operating activities |  |  |  |  |
Net income | $ | 70,654 |  |  | $ | 36,988 |  |  | $ | 40,235 |
Adjustments to reconcile net income to net cash used in operating activities: |  |  |  |  |
Increase in other assets | (4,034) |  |  | (1,008) |  |  | (1,073) |
Gains on securities, net | — |  |  | — |  |  | (10) |
Increase (decrease) in other liabilities | 12 |  |  | (1,499) |  |  | (36) |
Undistributed earnings of Northfield Bank | (70,956) |  |  | (37,544) |  |  | (40,012) |
Net cash used in operating activities | (4,324) |  |  | (3,063) |  |  | (896) |
Cash flows from investing activities |  |  |  |  |
Cash and cash equivalents acquired in business acquisition | — |  |  | 5,903 |  |  | — |
Dividends from Northfield Bank | 69,916 |  |  | 16,174 |  |  | 41,277 |
Net cash provided by investing activities | 69,916 |  |  | 22,077 |  |  | 41,277 |
Cash flows from financing activities |  |  |  |  |
Principal payments on ESOP loan receivable | 1,553 |  |  | 1,061 |  |  | 1,065 |
Purchase of treasury stock | (53,321) |  |  | (10,405) |  |  | (15,815) |
Dividends paid | (24,299) |  |  | (21,476) |  |  | (20,198) |
Exercise of stock options | 3,409 |  |  | 175 |  |  | 5,770 |
Net cash used in financing activities | (72,658) |  |  | (30,645) |  |  | (29,178) |
Net (decrease) increase in cash and cash equivalents | (7,066) |  |  | (11,631) |  |  | 11,203 |
Cash and cash equivalents at beginning of year | 21,477 |  |  | 33,108 |  |  | 21,905 |
Cash and cash equivalents at end of year | $ | 14,411 |  |  | $ | 21,477 |  |  | $ | 33,108 |

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