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Loans And Related Allowances For Loan Losses (Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
contract
Mar. 31, 2019
USD ($)
contract
Dec. 31, 2019
USD ($)
contract
Jun. 30, 2019
USD ($)
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans $ 11,012,000   $ 10,849,000 $ 2,100,000
Percentage of loan portfolio accruing loans past due 30 days or more     0.33%  
Financing receivable, modifications, number of contracts | contract 9,068      
Financing receivable, modifications, recorded investment $ 1,053,732,000      
Substandard [Member]        
Financing Receivable, Modifications [Line Items]        
Increase in non-accrual status $ 6,700,000      
COVID-19 [Member]        
Financing Receivable, Modifications [Line Items]        
Percentage of loan portfolio accruing loans past due 30 days or more 0.35%      
Partial Charge Off [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans $ 100,000   $ 100,000  
New TDRs [Member]        
Financing Receivable, Modifications [Line Items]        
Financing receivable, modifications, number of contracts | contract 0 0    
Existing TDRs [Member]        
Financing Receivable, Modifications [Line Items]        
Financing receivable, modifications, number of contracts | contract 0 2    
Financing receivable, modifications, subsequent default, recorded investment   $ 0    
Existing TDRs loans Remodified After Maturity [Member]        
Financing Receivable, Modifications [Line Items]        
Financing receivable, modifications, number of contracts | contract 15   15  
Financing receivable, modifications, recorded investment $ 4,100,000   $ 4,200,000  
Foreclosure 1-4 Family Real Estate Properties [Member]        
Financing Receivable, Modifications [Line Items]        
Loans secured by real estate properties in process of foreclosure 200,000   100,000  
Commercial real estate- non owner-occupied [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans 18,000   33,000  
Commercial real estate- all other CRE [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans 867,000   647,000  
All Other Acquisition And Development [Member]        
Financing Receivable, Modifications [Line Items]        
Increase in non-accrual status   $ 8,000,000    
Nonaccrual loans 8,158,000   8,058,000  
All Other Acquisition And Development [Member] | New TDRs [Member]        
Financing Receivable, Modifications [Line Items]        
Increase in non-accrual status $ 200,000      
Financing receivable, modifications, number of contracts | contract 1      
Commercial and industrial [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans     30,000  
Residential mortgage- term [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans $ 1,168,000   1,219,000  
Residential mortgage- home equity [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans 798,000   858,000  
Consumer [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans $ 3,000   $ 4,000