Fair Value Fair Value (Impaired Financing Receivables Additional Information) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Schedule of Impaired Financing Receivables Additional Information [Line Items]
Book Value Of Impaired Loans Carried At Fair Value	$ 19,395	$ 2,167
Partial Charge-Offs On Impaired Loans carried at Fair Value	247	313
Impaired Financing Receivable, Related Allowance	8,666	5,230
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount	91,288	70,171
Impaired Financing Receivable, Recorded Investment	116,180	77,491	$ 74,478
Impaired Loan Fair Value	16,226	2,090
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment	96,785	75,324
Partial Charge-offs on Impaired Loans carried at Cost	316	406
Impaired Financing Receivable, Carrying Value	107,514	72,261
Partial Charge-Offs On Impaired Loans	563	719
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	8,666	5,230
Financing Receivable, not collateral dependent [Domain]
Schedule of Impaired Financing Receivables Additional Information [Line Items]
Impaired Financing Receivable, Related Allowance	5,497	5,153
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Schedule of Impaired Financing Receivables Additional Information [Line Items]
Impaired Financing Receivable, Related Allowance	$ 3,169	$ 77