Fair Value Impaired financing receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Book Value Of Impaired Loans Carried At Fair Value	$ 2,167	$ 6,503
Partial Charge-Offs On Impaired Loans carried at Fair Value	313	3,630
Impaired Financing Receivable, Related Allowance	5,230	2,273
Impaired loans carried at fair value	2,090	6,399
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment	75,324	41,641
Partial Charge-offs on Impaired Loans carried at Cost	406	7,616
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount	70,171	39,472
Impaired Financing Receivable, Recorded Investment	77,491	48,144	$ 56,564
Partial charge-offs on impaired loans	719	11,246
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	5,230	2,273
Impaired Financing Receivable, Carrying Value	72,261	45,871
Impaired Financing Receivable, carried at fair value, related expense	200	400	$ 1,600
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	77	104
Financing Receivable, not collateral dependent [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	$ 5,153	$ 2,169