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Employee Stock Ownership Plan - Loan, Expense and Shares (Details) - USD ($)
3 Months Ended 6 Months Ended
Jan. 01, 2009
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Employee Stock Ownership Plan            
Allocated shares   489,423   489,423   466,807
Unearned shares   415,931   415,931   440,397
Total ESOP shares   905,354   905,354   907,204
Fair value of unearned shares, in thousands   $ 9,895,000   $ 9,895,000   $ 13,626,000
ESOP            
Employee Stock Ownership Plan            
Amount borrowed from employer $ 9,800,000          
Shares purchased 978,650          
Percentage of shares issued in initial public offering 8.00%          
Employee stock ownership plan, price per share of shares acquired in initial public offering (in dollars per share) $ 10.00          
Term of loan       20 years    
ESOP expense   $ 302,000 $ 345,000 $ 641,000 $ 679,000  
ESOP | Prime rate            
Employee Stock Ownership Plan            
Variable interest rate       prime rate, as published in The Wall Street Journal