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Loans (Aging of the Amortized Cost of Collateral-Dependent Loans Held For Investment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Commercial Portfolio Segment [Member] | Commercial Secured By Real Estate [Member] | Real Estate [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Amortized cost of collateral-dependent loans held for investment $ 27,737 $ 29,279