Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2019

Banking and Thrift [Abstract]

Regulatory Capital Ratios

The following tables present the regulatory capital ratios as of the dates indicated:

Flagstar Bancorp	Actual				For Capital Adequacy Purposes				Well-Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
	(Dollars in millions)
December 31, 2019
Tier 1 capital (to adjusted avg. total assets)	$	1,720	7.57	%	$	909	4.0	%	$	1,136	5.0	%
Common equity Tier 1 capital (to RWA)	1,480		9.32	%	715		4.5	%	1,033		6.5	%
Tier 1 capital (to RWA)	1,720		10.83	%	953		6.0	%	1,271		8.0	%
Total capital (to RWA)	1,830		11.52	%	1,271		8.0	%	1,589		10.0	%
December 31, 2018
Tier 1 capital (to adjusted avg. total assets)	$	1,505	8.29	%	$	726	4.0	%	$	908	5.0	%
Common equity Tier 1 capital (to RWA)	1,265		10.54	%	540		4.5	%	780		6.5	%
Tier 1 capital (to RWA)	1,505		12.54	%	720		6.0	%	960		8.0	%
Total capital (to RWA)	1,637		13.63	%	960		8.0	%	1,201		10.0	%

Flagstar Bank	Actual				For Capital Adequacy Purposes				Well-Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
	(Dollars in millions)
December 31, 2019
Tier 1 capital (to adjusted avg. total assets)	$	1,752	7.71	%	$	909	4.0	%	$	1,136	5.0	%
Common equity Tier 1 capital (to RWA)	1,752		11.04	%	714		4.5	%	1,032		6.5	%
Tier 1 capital (to RWA)	1,752		11.04	%	952		6.0	%	1,270		8.0	%
Total capital (to RWA)	1,862		11.73	%	1,270		8.0	%	1,587		10.0	%
December 31, 2018
Tier 1 capital (to adjusted avg. total assets)	$	1,574	8.67	%	$	726	4.0	%	$	908	5.0	%
Common equity Tier 1 capital (to RWA)	1,574		13.12	%	540		4.5	%	780		6.5	%
Tier 1 capital (to RWA)	1,574		13.12	%	720		6.0	%	960		8.0	%
Total capital (to RWA)	1,705		14.21	%	960		8.0	%	1,200		10.0	%