Regulatory Requirements (Tables)

12 Months Ended

Dec. 31, 2019

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, 2019 and 2018, 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, 2019:
Common Equity Tier 1 Capital (to risk-weighted assets)	$	598,462	14.99	%	$	179,626	4.50	%	$	259,459	6.50	%
Tier 1 Leverage	598,462		12.28		194,954		4.00		243,692		5.00
Tier I capital (to risk-weighted assets)	598,462		14.99		239,501		6.00		319,334		8.00
Total capital (to risk-weighted assets)	627,955		15.73		319,334		8.00		399,168		10.00
As of December 31, 2018:
Common Equity Tier 1 Capital (to risk-weighted assets)	$	592,815	16.00	%	$	166,742	4.50	%	$	240,850	6.50	%
Tier 1 Leverage	592,815		13.81		171,663		4.00		214,579		5.00
Tier I capital (to risk-weighted assets)	592,815		16.00		222,323		6.00		296,430		8.00
Total capital (to risk-weighted assets)	620,863		16.76		296,430		8.00		370,538		10.00

The following is a summary of the Company's regulatory capital amounts and ratios compared to the regulatory requirements as of December 31, 2019 and 2018, 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, 2019:
Common Equity Tier 1 Capital (to risk-weighted assets)	$	651,974	16.35	%	$	179,439	4.50	%	$	259,189	6.50	%
Tier 1 Leverage	651,974		13.37		195,018		4.00		243,772		5.00
Tier I capital (to risk-weighted assets)	651,974		16.35		239,251		6.00		319,002		8.00
Total capital (to risk-weighted assets)	681,467		17.09		319,002		8.00		398,752		10.00
As of December 31, 2018:
Common Equity Tier 1 Capital (to risk-weighted assets)	$	636,141	17.17	%	$	166,717	4.50	%	$	240,814	6.50	%
Tier 1 Leverage	636,141		14.82		171,724		4.00		214,656		5.00
Tier I capital (to risk-weighted assets)	636,141		17.17		222,290		6.00		296,386		8.00
Total capital (to risk-weighted assets)	664,190		17.93		296,386		8.00		370,483		10.00