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Collateralized Transactions - Additional Information (Narrative) (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
dealer
Dec. 31, 2015
USD ($)
Dec. 31, 2014
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 December 31, 2016:
(Expressed in thousands)
 
 
Overnight and Open
Repurchase agreements:
 
U.S. Treasury and Agency securities
$
378,084

Securities loaned:
 
Equity securities
179,875

Gross amount of recognized liabilities for repurchase agreements and securities loaned
$
557,959

   
Bank call loans $ 145,800,000 $ 100,200,000  
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 136,200,000    
Customer securities deposited to secure obligations and margin requirements under option contracts 284,000,000    
Outstanding letters of credit 0    
Fair value of the reverse repurchase agreements 24,006,000 [1] 206,499,000 [2]  
Fair value of the repurchase agreements 0    
Amounts pledged 438,385,000 546,334,000  
Carrying value of securities owned by the Company loaned or pledged $ 138,600,000 142,700,000  
Number of broker-dealers | dealer 2    
Receivable from brokers and clearing organizations $ 55,000,000    
Loans to Citizens $ 0    
Credit Concentration Risk      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Guaranteed mortgages for a period 15 days    
Interest expense $ 387,000 928,500 $ 570,700
Warehouse Facility | Credit Concentration Risk      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding under the warehouse facility line 0 54,300,000  
Reverse Repurchase Agreements      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Customer securities under customer margin loans agreement available to be repledged 24,000,000 278,800,000  
Securities received as collateral under securities borrowed transaction with market value 24,000,000 278,800,000  
Securities Borrowed Transactions      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Customer securities under customer margin loans agreement available to be repledged 37,400,000 36,000,000  
Securities received as collateral under securities borrowed transaction with market value 148,700,000 $ 217,000,000  
Corporate      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized loans, collateralized by firm 138,600,000    
Other Than Corporate Customer      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized loans, collateralized by customer securities 288,100,000    
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 557,959,000    
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 378,084,000    
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 $ 179,875,000    
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    
Mortgage Servicing Rights [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Continuous Prepayment Rate Used After Specified Loans Prepayment Penalty Rate Average 12.00%    
Estimated future cost to service loans on an annual basis per loan, average $ 1,250    
[1] .
[2] n