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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%

X

- Definition

Majority interest ownership percentage by parent.

+ References

No definition available.

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X

- Definition

Percentage owned by non-controlling interest.

+ References

No definition available.

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X

- Definition

Prepayment penalty charges.

+ References

No definition available.

+ Details

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X

- Definition

Servicing asset at carrying amount.

+ References

No definition available.

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X

- 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.

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X

- 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

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X

- 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

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