Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001493225-25-000047-index-headers.html | 2025-03-03 16:22:59 | |
| 0001493225-25-000047-index.html | 2025-03-03 16:22:59 | |
| 0001493225-25-000047.txt | 2025-03-03 16:22:59 | |
 0001493225-25-000047-xbrl.zip | 717359 | 2025-03-03 16:22:59 |
| FilingSummary.xml | 78268 | 2025-03-03 16:22:59 |
| Financial_Report.xlsx | 256853 | 2025-03-03 16:22:59 |
| MetaLinks.json | 1604661 | 2025-03-03 16:22:59 |
| nfbk-20241231.htm | 5370584 | 2025-03-03 16:22:59 |
| nfbk-20241231.xsd | 108994 | 2025-03-03 16:22:59 |
| nfbk-20241231_cal.xml | 202452 | 2025-03-03 16:22:59 |
| nfbk-20241231_def.xml | 596054 | 2025-03-03 16:22:59 |
 nfbk-20241231_g1.jpg | 131373 | 2025-03-03 16:22:59 |
| nfbk-20241231_htm.xml | 5905055 | 2025-03-03 16:22:59 |
| nfbk-20241231_lab.xml | 1300802 | 2025-03-03 16:22:59 |
| nfbk-20241231_pre.xml | 1021634 | 2025-03-03 16:22:59 |
| nfbk20241231exhibit19.htm | 53191 | 2025-03-03 16:22:59 |
| nfbk20241231exhibit231.htm | 2020 | 2025-03-03 16:22:59 |
| nfbk20241231exhibit232.htm | 2712 | 2025-03-03 16:22:59 |
| nfbk20241231exhibit311.htm | 11021 | 2025-03-03 16:22:59 |
| nfbk20241231exhibit312.htm | 10954 | 2025-03-03 16:22:59 |
| nfbk20241231exhibit32.htm | 10903 | 2025-03-03 16:22:59 |
| R1.htm | 64976 | 2025-03-03 16:22:59 |
| R10.htm | 155784 | 2025-03-03 16:22:59 |
| R100.htm | 18003 | 2025-03-03 16:22:59 |
| R101.htm | 11924 | 2025-03-03 16:22:59 |
| R102.htm | 16080 | 2025-03-03 16:22:59 |
| R103.htm | 9864 | 2025-03-03 16:22:59 |
| R104.htm | 12609 | 2025-03-03 16:22:59 |
| R105.htm | 78926 | 2025-03-03 16:22:59 |
| R106.htm | 41004 | 2025-03-03 16:22:59 |
| R107.htm | 36820 | 2025-03-03 16:22:59 |
| R108.htm | 8982 | 2025-03-03 16:22:59 |
| R109.htm | 7344 | 2025-03-03 16:22:59 |
| R11.htm | 71953 | 2025-03-03 16:22:59 |
| R110.htm | 21396 | 2025-03-03 16:22:59 |
| R111.htm | 30635 | 2025-03-03 16:22:59 |
| R112.htm | 120672 | 2025-03-03 16:22:59 |
| R113.htm | 33167 | 2025-03-03 16:22:59 |
| R114.htm | 11718 | 2025-03-03 16:22:59 |
| R115.htm | 91999 | 2025-03-03 16:22:59 |
| R116.htm | 39123 | 2025-03-03 16:22:59 |
| R117.htm | 31503 | 2025-03-03 16:22:59 |
| R118.htm | 32364 | 2025-03-03 16:22:59 |
| R119.htm | 17046 | 2025-03-03 16:22:59 |
| R12.htm | 155750 | 2025-03-03 16:22:59 |
| R120.htm | 18286 | 2025-03-03 16:22:59 |
| R121.htm | 20591 | 2025-03-03 16:22:59 |
| R122.htm | 11635 | 2025-03-03 16:22:59 |
| R123.htm | 12915 | 2025-03-03 16:22:59 |
| R124.htm | 51511 | 2025-03-03 16:22:59 |
| R125.htm | 45729 | 2025-03-03 16:22:59 |
| R126.htm | 61962 | 2025-03-03 16:22:59 |
| R127.htm | 73501 | 2025-03-03 16:22:59 |
| R13.htm | 765404 | 2025-03-03 16:22:59 |
| R14.htm | 220015 | 2025-03-03 16:22:59 |
| R15.htm | 17414 | 2025-03-03 16:22:59 |
| R16.htm | 54642 | 2025-03-03 16:22:59 |
| R17.htm | 63386 | 2025-03-03 16:22:59 |
| R18.htm | 5856 | 2025-03-03 16:22:59 |
| R19.htm | 89026 | 2025-03-03 16:22:59 |
| R2.htm | 7801 | 2025-03-03 16:22:59 |
| R20.htm | 68278 | 2025-03-03 16:22:59 |
| R21.htm | 54050 | 2025-03-03 16:22:59 |
| R22.htm | 16180 | 2025-03-03 16:22:59 |
| R23.htm | 51993 | 2025-03-03 16:22:59 |
| R24.htm | 257778 | 2025-03-03 16:22:59 |
| R25.htm | 20991 | 2025-03-03 16:22:59 |
| R26.htm | 12193 | 2025-03-03 16:22:59 |
| R27.htm | 33586 | 2025-03-03 16:22:59 |
| R28.htm | 31055 | 2025-03-03 16:22:59 |
| R29.htm | 11859 | 2025-03-03 16:22:59 |
| R3.htm | 118268 | 2025-03-03 16:22:59 |
| R30.htm | 87142 | 2025-03-03 16:22:59 |
| R31.htm | 42173 | 2025-03-03 16:22:59 |
| R32.htm | 14634 | 2025-03-03 16:22:59 |
| R33.htm | 8481 | 2025-03-03 16:22:59 |
| R34.htm | 4387 | 2025-03-03 16:22:59 |
| R35.htm | 47737 | 2025-03-03 16:22:59 |
| R36.htm | 123377 | 2025-03-03 16:22:59 |
| R37.htm | 194420 | 2025-03-03 16:22:59 |
| R38.htm | 143106 | 2025-03-03 16:22:59 |
| R39.htm | 760884 | 2025-03-03 16:22:59 |
| R4.htm | 29502 | 2025-03-03 16:22:59 |
| R40.htm | 213284 | 2025-03-03 16:22:59 |
| R41.htm | 16046 | 2025-03-03 16:22:59 |
| R42.htm | 58284 | 2025-03-03 16:22:59 |
| R43.htm | 56683 | 2025-03-03 16:22:59 |
| R44.htm | 89016 | 2025-03-03 16:22:59 |
| R45.htm | 62665 | 2025-03-03 16:22:59 |
| R46.htm | 47781 | 2025-03-03 16:22:59 |
| R47.htm | 9752 | 2025-03-03 16:22:59 |
| R48.htm | 45645 | 2025-03-03 16:22:59 |
| R49.htm | 235101 | 2025-03-03 16:22:59 |
| R5.htm | 151972 | 2025-03-03 16:22:59 |
| R50.htm | 20437 | 2025-03-03 16:22:59 |
| R51.htm | 27994 | 2025-03-03 16:22:59 |
| R52.htm | 29665 | 2025-03-03 16:22:59 |
| R53.htm | 16476 | 2025-03-03 16:22:59 |
| R54.htm | 88059 | 2025-03-03 16:22:59 |
| R55.htm | 34522 | 2025-03-03 16:22:59 |
| R56.htm | 43684 | 2025-03-03 16:22:59 |
| R57.htm | 40180 | 2025-03-03 16:22:59 |
| R58.htm | 26087 | 2025-03-03 16:22:59 |
| R59.htm | 42687 | 2025-03-03 16:22:59 |
| R6.htm | 84980 | 2025-03-03 16:22:59 |
| R60.htm | 43688 | 2025-03-03 16:22:59 |
| R61.htm | 21445 | 2025-03-03 16:22:59 |
| R62.htm | 14173 | 2025-03-03 16:22:59 |
| R63.htm | 21478 | 2025-03-03 16:22:59 |
| R64.htm | 13016 | 2025-03-03 16:22:59 |
| R65.htm | 46327 | 2025-03-03 16:22:59 |
| R66.htm | 20114 | 2025-03-03 16:22:59 |
| R67.htm | 178563 | 2025-03-03 16:22:59 |
| R68.htm | 13281 | 2025-03-03 16:22:59 |
| R69.htm | 118128 | 2025-03-03 16:22:59 |
| R7.htm | 6531 | 2025-03-03 16:22:59 |
| R70.htm | 204320 | 2025-03-03 16:22:59 |
| R71.htm | 27337 | 2025-03-03 16:22:59 |
| R72.htm | 18557 | 2025-03-03 16:22:59 |
| R73.htm | 16325 | 2025-03-03 16:22:59 |
| R74.htm | 61708 | 2025-03-03 16:22:59 |
| R75.htm | 15550 | 2025-03-03 16:22:59 |
| R76.htm | 11557 | 2025-03-03 16:22:59 |
| R77.htm | 61681 | 2025-03-03 16:22:59 |
| R78.htm | 6487 | 2025-03-03 16:22:59 |
| R79.htm | 7889 | 2025-03-03 16:22:59 |
| R8.htm | 136673 | 2025-03-03 16:22:59 |
| R80.htm | 11920 | 2025-03-03 16:22:59 |
| R81.htm | 95090 | 2025-03-03 16:22:59 |
| R82.htm | 21743 | 2025-03-03 16:22:59 |
| R83.htm | 8654 | 2025-03-03 16:22:59 |
| R84.htm | 41252 | 2025-03-03 16:22:59 |
| R85.htm | 7751 | 2025-03-03 16:22:59 |
| R86.htm | 14631 | 2025-03-03 16:22:59 |
| R87.htm | 9865 | 2025-03-03 16:22:59 |
| R88.htm | 15134 | 2025-03-03 16:22:59 |
| R89.htm | 24301 | 2025-03-03 16:22:59 |
| R9.htm | 66758 | 2025-03-03 16:22:59 |
| R90.htm | 27199 | 2025-03-03 16:22:59 |
| R91.htm | 18541 | 2025-03-03 16:22:59 |
| R92.htm | 19981 | 2025-03-03 16:22:59 |
| R93.htm | 26902 | 2025-03-03 16:22:59 |
| R94.htm | 25656 | 2025-03-03 16:22:59 |
| R95.htm | 29270 | 2025-03-03 16:22:59 |
| R96.htm | 47002 | 2025-03-03 16:22:59 |
| R97.htm | 5692 | 2025-03-03 16:22:59 |
| R98.htm | 12792 | 2025-03-03 16:22:59 |
| R99.htm | 74452 | 2025-03-03 16:22:59 |
| report.css | 2768 | 2025-03-03 16:22:59 |
| Show.js | 1086 | 2025-03-03 16:22:59 |