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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Consolidated Statements of Changes in Stockholders’ Equity      
ESOP shares committed to be released 230,724 106,576 106,576
Conversion costs | $ $ 6.3    
Shares purchased by the ESOP 2,482,945    
ESOP shares committed to be released 230,724 106,575