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Collateralized Transactions - Additional Information (Narrative) (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
dealer
Dec. 31, 2016
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings
The following table presents a disaggregation of the gross obligation by the class of collateral pledged and the remaining contractual maturity of the repurchase agreements and securities loaned transactions as of March 31, 2017:
(Expressed in thousands)
 
 
Overnight and Open
Repurchase agreements:
 
U.S. Treasury and Agency securities
$
677,748

Securities loaned:
 
Equity securities
142,121

Gross amount of recognized liabilities for repurchase agreements and securities loaned
$
819,869

 
Bank call loans $ 195,700,000 $ 145,800,000
Customer securities under customer margin loans available to be pledged 1,200,000,000  
Customer securities under customer margin loans agreement available to be repledged 108,100,000  
Customer securities deposited to secure obligations and margin requirements under option contracts 256,300,000  
Outstanding letters of credit 0  
Fair value of the reverse repurchase agreements 3,896,000 24,006,000
Fair value of the repurchase agreements 0  
Amounts pledged 705,988,000 438,385,000
Carrying value of securities owned by the Company loaned or pledged $ 152,900,000 138,600,000
Number of broker-dealers | dealer 4  
Receivable from brokers and clearing organizations $ 95,000,000  
Reverse Repurchase Agreements    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Customer securities under customer margin loans agreement available to be repledged 225,500,000 24,000,000
Securities received as collateral under securities borrowed transaction with market value 225,500,000 24,000,000
Securities Borrowed Transactions    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Customer securities under customer margin loans agreement available to be repledged 28,200,000 37,400,000
Securities received as collateral under securities borrowed transaction with market value 155,100,000 $ 148,700,000
Corporate    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Collateralized loans, collateralized by firm 152,800,000  
Other Than Corporate Customer    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Collateralized loans, collateralized by customer securities 238,000,000  
Maturity Overnight and on Demand [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement 819,869,000  
U.S. treasury, agency and sovereign obligations | Maturity Overnight and on Demand [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 677,748,000  
Equity Securities [Member] | Maturity Overnight and on Demand [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred $ 142,121,000  
Minimum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Number of business days for related transactions 1 day  
Maximum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Number of business days for related transactions 3 days