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Summary of Significant Accounting Policies (Accounting Standards Adopted in 2020) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for loan loss $ 136,589 $ 218,011   $ 3,025 $ 1,986 $ 1,651 $ 968
Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for loan loss     $ 8,300