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Collateralized Transactions - Additional Information (Narrative) (Details) | 12 Months Ended
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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] | .
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