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Loans and Allowance for Loan Losses (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 26, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]            
Interest income   $ 23,042 $ 22,817 $ 69,963 $ 65,804  
Part of loans of 30 days or more past due as a percentage of total loan portfolio   0.26%   0.26%   0.23%
Net of deferred loan fees and costs   $ 3,600   $ 3,600   $ 3,300
Commercial Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Part of loans of 30 days or more past due as a percentage of total loan portfolio   0.08%   0.08%   0.10%
Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Part of loans of 30 days or more past due as a percentage of total loan portfolio   0.18%   0.18%   0.13%
Paycheck Protection Program [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Percentage of SBA to guarantee of certain loans       100.00%    
Number of loan processed       853    
Loans receivables   $ 97,500   $ 97,500    
Interest income $ 2,200     $ 3,900