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PCI Loans and Related Allowance for Loan Losses (Summary of Changes in Accretable Yield) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
PCI Loans and Related Allowance for Loan Losses [Abstract]    
Beginning Balance $ 33,466 $ 38,107
Accretion (3,110) (6,010)
Reclassification from nonaccretable difference   1,369
Reclassification to nonaccretable difference (101)  
Ending Balance $ 30,255 $ 33,466