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Parent-only Financial Information - Condensed Statements of Cash Flows (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
Cash flows from operating activities:                      
Net income $ 16,103 $ 16,080 $ 19,794 $ 18,677 $ 13,062 $ 8,582 $ 10,793 $ 4,551 $ 70,654 $ 36,988 $ 40,235
Adjustments to reconcile net income to net cash used in operating activities:                      
Increase in other assets                 (14,531) 1,294 2,679
Net cash used in operating activities                 64,759 55,214 51,152
Cash flows from investing activities:                      
Net cash acquired in business combinations                 0 72,875 0
Net cash provided by (used in) investing activities                 84,995 (131,925) (522,725)
Cash flows from financing activities:                      
Exercise of stock options                 3,409 175 5,770
Net cash (used in) provided by financing activities                 (146,230) 16,437 541,629
Net (decrease) increase in cash and cash equivalents                 3,524 (60,274) 70,056
Cash and cash equivalents at beginning of year       87,544       147,818 87,544 147,818 77,762
Cash and cash equivalents at end of year 91,068       87,544       91,068 87,544 147,818
Parent Company                      
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                 0 0 (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:                      
Net cash acquired in business combinations                 0 5,903 0
Dividends from Northfield Bank                 69,916 16,174 41,277
Net cash provided by (used in) 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) provided by 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 21,477 33,108 21,905
Cash and cash equivalents at end of year $ 14,411       $ 21,477       $ 14,411 $ 21,477 $ 33,108