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Basis of Presentation and Changes in Significant Accounting Policies - Dividend (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 10, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jul. 21, 2020
Goodwill and Core Deposit Intangible              
Amortization of core deposit intangible     $ 124,000 $ 121,000 $ 252,000 $ 253,000  
Subsequent Events              
Payments of Dividends   $ 30,000,000.0          
Subsequent Event              
Subsequent Events              
Dividends Payable, Amount Per Share             $ 0.01
Payments of Dividends $ 296,000