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Commercial Mortgage Banking - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Servicing Liability at Amortized Cost [Line Items] |  |  |  |  |
Company owned OMHHF | 83.68% |  | 83.68% |  |
Prepayment costs | $ 2.8 | $ 4.3 | $ 13.5 | $ 5.9 |
Custodial escrow accounts | 272.4 |  | 272.4 |  | 242.7
Uninsured balance relation to escrow accounts | 176.8 |  | 176.8 |  |
Servicing rights are amortized using straight-line method |  |  | 10 years |  |
Mortgage Servicing Rights [Member] |  |  |  |  |
Servicing Liability at Amortized Cost [Line Items] |  |  |  |  |
Fair value of servicing rights | 38.5 |  | 38.5 |  | 33.0
Carrying value of loan servicing rights | $ 28.1 |  | $ 28.1 |  | $ 27.0
OMHHF [Member] |  |  |  |  |
Servicing Liability at Amortized Cost [Line Items] |  |  |  |  |
Company owned OMHHF | 83.68% |  | 83.68% |  |
Non-controlling interest | 16.32% |  | 16.32% |  |
Number of related party |  |  | 1 |  |

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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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