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Commercial Mortgage Banking - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Servicing Liability at Amortized Cost [Line Items] |  |  |
Company owned OMHHF | 83.68% |  |
Prepayment penalty | $ 7,700,000 | $ 600,000 |
Custodial escrow accounts | 296,200,000 |  | 242,700,000
Uninsured balance relation to escrow accounts | 201,200,000 |  |
Mortgage Servicing Rights [Member] |  |  |
Servicing Liability at Amortized Cost [Line Items] |  |  |
Fair value of servicing rights | 35,700,000 |  | 33,000,000
Carrying value of loan servicing rights | $ 27,700,000 |  | $ 27,000,000
OMHHF [Member] |  |  |
Servicing Liability at Amortized Cost [Line Items] |  |  |
Company owned OMHHF | 83.68% |  |
Non-controlling Interest | 16.32% |  |

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- Definition Majority interest ownership percentage by parent. + References No definition available. + Details
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- Definition Percentage owned by non-controlling interest. + References No definition available. + Details
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- Definition Prepayment penalty charges. + References No definition available. + Details
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- Definition Servicing asset at carrying amount. + References No definition available. + Details
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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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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 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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- Details
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