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Basis of Presentation and Changes in Significant Accounting Policies - Dividend (Details) - USD ($)
3 Months Ended 9 Months Ended
Nov. 09, 2020
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Oct. 19, 2020
Goodwill and Core Deposit Intangible              
Amortization of core deposit intangible   $ 122,000   $ 157,000 $ 374,000 $ 410,000  
Subsequent Events              
Dividends Payable, Amount Per Share             $ 0.01
Payments of Dividends     $ 30,000,000.0        
Subsequent Event              
Subsequent Events              
Dividends Payable, Amount Per Share             $ 0.01
Payments of Dividends $ 295,000