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Summary of Significant Accounting Policies (Adoption of New Accounting Standards) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Provision for loan losses   $ 9,052 $ 6,482 $ 16,937
Cumulative Effect, Period of Adoption, Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Provision for loan losses $ 3,300      
Provision for losses on net investment in leases $ 9,100