Variable Interest Entity (VIE) (Schedule Of The Total Unpaid Principal Amount Of Assets Held In Private Label Securitization Entities, Including Those In Which The Company Has Continuing Involvement) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Assets	$ 5,656,963	$ 4,437,911
Investments in WS 2014	$ 39,200
CRE1 [Member]
Variable Interest Entity [Line Items]
Acquisition of notes, percentage	100.00%
CRE2 [Member]
Variable Interest Entity [Line Items]
Acquisition of notes, percentage	49.00%
CRE1 [Member]
Variable Interest Entity [Line Items]
Assets held in nonconsolidated VIEs with continuing involvement	$ 52,143	126,393
The Company's interest in securitized assets in nonconsolidated VIEs	16,794	16,687
CRE1 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	52,143	126,393
CRE2 [Member]
Variable Interest Entity [Line Items]
Assets held in nonconsolidated VIEs with continuing involvement	134,216	238,231
The Company's interest in securitized assets in nonconsolidated VIEs	12,570	16,565
CRE2 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	134,216	238,231
CRE3 [Member]
Variable Interest Entity [Line Items]
Assets held in nonconsolidated VIEs with continuing involvement	221,285	284,069
The Company's interest in securitized assets in nonconsolidated VIEs	19,861	24,390
CRE3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	221,285	284,069
CRE4 [Member]
Variable Interest Entity [Line Items]
Assets held in nonconsolidated VIEs with continuing involvement	296,827	336,374
The Company's interest in securitized assets in nonconsolidated VIEs	29,612	32,513
CRE4 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	296,827	336,374
CRE5 [Member]
Variable Interest Entity [Line Items]
Assets held in nonconsolidated VIEs with continuing involvement	494,567
The Company's interest in securitized assets in nonconsolidated VIEs	38,496
CRE5 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	494,567
CRE6 [Member]
Variable Interest Entity [Line Items]
Assets held in nonconsolidated VIEs with continuing involvement	775,557
The Company's interest in securitized assets in nonconsolidated VIEs	51,558
CRE6 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	$ 775,557
WS 2014 [Member]
Variable Interest Entity [Line Items]
Equity interest in WS 2014	49.00%
Commercial And Other [Member]
Variable Interest Entity [Line Items]
Assets held in nonconsolidated VIEs with continuing involvement	$ 56,661	152,893
The Company's interest in securitized assets in nonconsolidated VIEs	39,154	59,273
Commercial And Other [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	$ 56,661	$ 152,893