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Regulatory Requirements (Tables) | 12 Months Ended
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Dec. 31, 2021
Regulatory Requirements [Abstract] |
Bank's Regulatory Capital Amounts And Ratios Compared To Regulatory Requirements | The following is a summary of Northfield Bank’s regulatory capital amounts and ratios compared to the regulatory requirements as of December 31, 2021 and 2020, for classification as a well-capitalized institution and minimum capital (dollars in thousands):
|  |  |  |  |  |  |  |  | For Well
|  |  |  |  | For Capital |  | Capitalized
|  |  |  |  | Adequacy |  | Under Prompt Corrective
| Actual |  | Purposes |  | Action Provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of December 31, 2021: |  |  |  |  |  |  |  |  |  |  |
CBLR | $ | 659,522 |  |  | 12.24 | % |  | $ | 457,872 |  |  | 8.50 | % |  | $ | 457,872 |  |  | 8.50 | %
As of December 31, 2020: |  |  |  |  |  |  |  |  |  |  |
CBLR | $ | 656,324 |  |  | 11.96 | % |  | $ | 439,124 |  |  | 8.00 | % |  | $ | 439,124 |  |  | 8.00 | %
The following is a summary of the Company's regulatory capital amounts and ratios compared to the regulatory requirements as of December 31, 2021 and 2020, for classification as well-capitalized and minimum capital (dollars in thousands).
|  |  |  |  |  |  |  |  | For Well
|  |  |  |  | For Capital |  | Capitalized
|  |  |  |  | Adequacy |  | Under Prompt Corrective
| Actual |  | Purposes |  | Action Provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of December 31, 2021: |  |  |  |  |  |  |  |  |  |  |
CBLR | $ | 696,368 |  |  | 12.93 | % |  | $ | 457,751 |  |  | 8.50 | % |  | $ | 457,751 |  |  | 8.50 | %
As of December 31, 2020: |  |  |  |  |  |  |  |  |  |  |
CBLR | $ | 698,864 |  |  | 12.73 | % |  | $ | 439,219 |  |  | 8.00 | % |  | $ | 439,219 |  |  | 8.00 | %

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- Definition Regulatory Capital Requirements under Banking Regulations [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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