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Impact of Recent Accounting Pronouncements (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2020
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Allowance for credit losses $ 55,525 $ 106,314 $ 55,525 $ 55,562 $ 86,259 $ 57,344 $ 62,810
Accounting standards update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201602Member      
Provision for credit losses for off-balance sheet credit exposure $ 0 $ 8,900          
Retained earnings   $ 694,240 $ 695,273        
Cumulative Effect, Period of Adoption, Adjustment              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Allowance for credit losses 7,920            
Provision for credit losses for off-balance sheet credit exposure 3,206            
Retained earnings 8,300            
Cumulative Effect, Period of Adoption, Adjustment | Construction              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Allowance for credit losses $ 1,300