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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

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