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PCI Loans and Related Allowance for Loan Losses (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jan. 30, 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Purchased credit impaired (PCI) loans $ 27,146   $ 27,146   $ 32,528  
Allowance For Loan And Lease Losses Write Offs 42 $ 576 754 $ 1,256    
Allowance For Loan And Lease Loss Recovery Of Bad Debts 132 150 453 541    
Allowance for loan losses, PCI loans 0 $ 0 0 $ 0    
Purchase Credit Impaired (PCI) Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Purchased credit impaired (PCI) loans 27,146   27,146   32,528  
Covered Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Purchased credit impaired (PCI) loans           $ 198,300
Loans met criteria of ASC 310-30           49,100
Outstanding contractual balance of covered loans other than 1-4 family loans $ 46,600   $ 46,600   $ 53,200  
Covered Loans [Member] | Residential 1-4 Family [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Remaining of loans acquired           $ 149,100