Fair Value Fair Value (Impaired Financing Receivables Additional Information) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Schedule of Impaired Financing Receivables Additional Information [Line Items]
Book Value Of Impaired Loans Carried At Fair Value	$ 1,028	$ 8,256
Partial Charge-Offs On Impaired Loans carried at Fair Value	240	269
Impaired Financing Receivable, Related Allowance		5,434
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount	74,950	96,097
Impaired Financing Receivable, Recorded Investment	79,264	108,455	$ 116,180
Impaired Loan Fair Value	848	6,924
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment	78,236	100,199
Partial Charge-offs on Impaired Loans carried at Cost	448	386
Impaired Financing Receivable, Carrying Value	75,798	103,021
Partial Charge-Offs On Impaired Loans	688	655
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3,466	5,434
Financing Receivable, not collateral dependent [Domain]
Schedule of Impaired Financing Receivables Additional Information [Line Items]
Impaired Financing Receivable, Related Allowance	3,286	4,102
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Schedule of Impaired Financing Receivables Additional Information [Line Items]
Impaired Financing Receivable, Related Allowance	$ 180	$ 1,332