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Commercial Mortgage Banking - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014 Parties	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Mortgage Banking [Abstract]
Percentage of controlling interest owned by the company in OMHHF	83.68%
Non-controlling interest	16.32%
Number of related party	1
Prepayment costs	$ 340,000.0	$ 3,000,000
Custodial escrow accounts	257,100,000		251,400,000
Uninsured balance relation to escrow accounts	157,000,000
Fair value of servicing rights	40,900,000		40,100,000
Carrying value of loan servicing rights	$ 29,226,000	$ 27,187,000	$ 28,879,000	$ 26,983,000
Servicing rights are amortized using straight-line method	10 years

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Percentage owned by non-controlling interest.

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Number of related party.

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Prepayment penalty charges.

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The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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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)

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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.

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Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 50

-Section 25

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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.

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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