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Parent-only Financial Information - Condensed Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income tax expense $ 5,810 $ 6,078 $ 7,639 $ 6,946 $ 4,418 $ 3,095 $ 3,899 $ 1,625 $ 26,473 $ 13,037 $ 12,787
Net income $ 16,103 $ 16,080 $ 19,794 $ 18,677 $ 13,062 $ 8,582 $ 10,793 $ 4,551 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
Parent Company                      
Interest on ESOP loan                 677 1,043 1,263
Interest income on deposits in other financial institutions                 18 129 229
Gains on securities, net                 0 0 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
Other comprehensive (loss) income, net of tax                 (11,097) 8,461 13,846
Comprehensive income                 $ 59,557 $ 45,449 $ 54,081