Fair Value Impaired financing receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Book Value Of Impaired Loans Carried At Fair Value	$ 8,256	$ 2,167
Partial Charge-Offs On Impaired Loans carried at Fair Value	269	313
Impaired Financing Receivable, Related Allowance	5,434	5,230
Impaired loans carried at fair value	6,924	2,090
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment	100,199	75,324
Partial Charge-offs on Impaired Loans carried at Cost	386	406
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount	96,097	70,171
Impaired Financing Receivable, Recorded Investment	108,455	77,491	$ 48,144
Partial charge-offs on impaired loans	655	719
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	5,434	5,230
Impaired Financing Receivable, Carrying Value	103,021	72,261
Impaired Financing Receivable, carried at fair value, related expense	4,700	200	$ 400
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	1,332	77
Financing Receivable, not collateral dependent [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	$ 4,102	$ 5,153