Subsequent Events (Narrative) (Details) - USD ($)		12 Months Ended
	Jan. 16, 2020	Dec. 31, 2019
FFBW, MHC [Member]
Subsequent Event [Line Items]
Percentage of shares held by Mutual Holding Company		$ 55.4
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock issued during period, shares	4,268,570
Issuance of common stock, net of issuance costs	$ 41,500,000
Sale of stock, price per share	$ 10.00
Subsequent Event [Member] | FFBW, MHC [Member]
Subsequent Event [Line Items]
Stock issued during period, shares	3,436,430