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Fair Value Fair Value (Impaired Financing Receivables Additional Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Schedule of Impaired Financing Receivables Additional Information [Line Items]      
Book Value Of Impaired Loans Carried At Fair Value $ 7,890 $ 8,256  
Partial Charge-Offs On Impaired Loans carried at Fair Value 203 269  
Impaired Financing Receivable, Related Allowance   5,434  
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount 87,961 96,097  
Impaired Financing Receivable, Recorded Investment 100,407 108,455 $ 85,851
Impaired Loan Fair Value 7,484 6,924  
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment 92,517 100,199  
Partial Charge-offs on Impaired Loans carried at Cost 386 386  
Impaired Financing Receivable, Carrying Value 95,445 103,021  
Partial Charge-Offs On Impaired Loans 589 655  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 4,962 5,434  
Financing Receivable, not collateral dependent [Domain]      
Schedule of Impaired Financing Receivables Additional Information [Line Items]      
Impaired Financing Receivable, Related Allowance 4,556 4,102  
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]      
Schedule of Impaired Financing Receivables Additional Information [Line Items]      
Impaired Financing Receivable, Related Allowance $ 406 $ 1,332