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, 2020		Dec. 31, 2019
Variable Interest Entity [Line Items]
Total assets		$ 6,276,841		$ 5,656,963
Investments in WS 2014		31,300
CRE1 [Member]
Variable Interest Entity [Line Items]
The Company's interest in securitized assets in nonconsolidated VIEs		$ 7,342	[1],[2]	16,794
Acquisition of notes, percentage		100.00%
CRE1 [Member] | Asset Pledged as Collateral [Member]
Variable Interest Entity [Line Items]
Total assets		$ 35,000
CRE1 [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Total assets		28,152	[1]	52,143
CRE2 [Member]
Variable Interest Entity [Line Items]
The Company's interest in securitized assets in nonconsolidated VIEs		12,574	[1],[2]	12,570
Remaining principal amount to be repaid on securities		$ 114,200
Percent of excess credit support		27.00%
Acquisition of notes, percentage		49.00%
CRE2 [Member] | Asset Pledged as Collateral [Member]
Variable Interest Entity [Line Items]
Total assets		$ 137,000
CRE2 [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Total assets		114,205	[1]	134,216
CRE3 [Member]
Variable Interest Entity [Line Items]
The Company's interest in securitized assets in nonconsolidated VIEs		17,495	[2]	19,861
CRE3 [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Total assets		111,158		221,285
CRE4 [Member]
Variable Interest Entity [Line Items]
The Company's interest in securitized assets in nonconsolidated VIEs		25,575	[2]	29,612
CRE4 [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Total assets		157,038		296,827
CRE5 [Member]
Variable Interest Entity [Line Items]
The Company's interest in securitized assets in nonconsolidated VIEs		33,042	[2]	38,496
CRE5 [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Total assets		350,569		494,567
CRE6 [Member]
Variable Interest Entity [Line Items]
The Company's interest in securitized assets in nonconsolidated VIEs		51,558	[2]	51,558
CRE6 [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Total assets		$ 625,773		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]
The Company's interest in securitized assets in nonconsolidated VIEs		$ 31,294	[2]	39,154
Commercial And Other [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Total assets		43,982		56,661
Variable Interest Entity [Member] | CRE1 [Member]
Variable Interest Entity [Line Items]
Total assets	[3]	28,152	[1]	52,143
Variable Interest Entity [Member] | CRE2 [Member]
Variable Interest Entity [Line Items]
Total assets	[3]	114,205	[1]	134,216
Variable Interest Entity [Member] | CRE3 [Member]
Variable Interest Entity [Line Items]
Total assets	[3]	111,158		221,285
Variable Interest Entity [Member] | CRE4 [Member]
Variable Interest Entity [Line Items]
Total assets	[3]	157,038		296,827
Variable Interest Entity [Member] | CRE5 [Member]
Variable Interest Entity [Line Items]
Total assets	[3]	350,569		494,567
Variable Interest Entity [Member] | CRE6 [Member]
Variable Interest Entity [Line Items]
Total assets	[3]	625,773		775,557
Variable Interest Entity [Member] | Commercial And Other [Member]
Variable Interest Entity [Line Items]
Total assets	[3]	$ 43,982		$ 56,661

[1] As of December 31, 2020 the principal balance of the security the Company owned issued by CRE-1 was $7.3 million. Repayment is expected from the workout or disposition of commercial real estate collateral, all proceeds of which will first repay our $7.3 million balance. The collateral consists of a hotel in a high-density populated area in a northeastern major metropolitan area. The hotel is valued at over $35 million, based upon a post-Covid 2020 appraisal. As of December 31, 2020 the principal balance of the security the Company owned issued by CRE-2 was $12.6 million. Repayment is expected from the workout or disposition of commercial real estate collateral, after repayment of more senior tranches. Our $12.6 million security has 27% excess credit support; thus, losses of 27% of remaining security balances would have to be incurred, prior to any loss on our security. Additionally, the commercial real estate collateral was appraised in 2017, with certain of those appraisals updated in 2020 at the direction of the special servicer, for an appraised value of approximately $137 million. The remaining principal to be repaid on all securities is approximately $114.2 million. The excess of the appraised amount over the remaining principal to be repaid on all securities further reduces credit risk, in addition to the 27% credit support within the securitization structure. However, reappraisals for remaining properties could result in further decreases in collateral valuation. While available information indicates that collateral valuation will be adequate to repay our security, there can be no assurance that such valuations will be realized upon loan resolutions, and that deficiencies will not exceed the 27% credit support.

[2] For securities purchased from securitizations which comprise the Company's interest: CRE1 and CRE2 are non-rated and CRE3, CRE4, CRE5 and CRE6 were "A-" rated as of December 31, 2020. CRE1, CRE2, CRE3, CRE4, and CRE5 are valued by discounted cash flow analysis and CRE6 is priced by a pricing service.

[3] Consists of commercial loans predominantly secured by real estate.