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Summary of Significant Accounting Policies - Dividend (Details) - USD ($)
3 Months Ended
May 06, 2019
Mar. 31, 2019
Mar. 31, 2018
Apr. 16, 2019
Jan. 16, 2019
Jan. 16, 2009
Goodwill and Core Deposit Intangible            
Amortization of core deposit intangible   $ 132,000 $ 21,000      
Subsequent Events            
Exercise price of warrant         $ 14.23 $ 13.43
Subsequent Event            
Subsequent Events            
Dividends Payable, Amount Per Share       $ 0.01    
Payments of Dividends $ 298,000