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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 |  |  |  |  |  |

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