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Summary of Significant Accounting Policies - Dividend (Details) - USD ($)
3 Months Ended 9 Months Ended
Nov. 04, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Oct. 15, 2019
Jan. 16, 2019
Goodwill and Core Deposit Intangible              
Amortization of core deposit intangible   $ 157,000 $ 136,000 $ 410,000 $ 254,000    
Subsequent Events              
Exercise price of warrant     $ 13.43   $ 13.43   $ 14.23
Subsequent Event              
Subsequent Events              
Dividends Payable, Amount Per Share           $ 0.01  
Payments of Dividends $ 299,000