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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Consolidated Statements of Stockholders' Equity, Share Data    
Cash dividends declared per common share (in dollars per share) $ 1.49 $ 1.14
Common Stock    
Consolidated Statements of Stockholders' Equity, Share Data    
Allocation of ESOP shares, shares 48,932 48,932