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Financial Instruments - Notional and Fair Values of TBA's (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Sep. 20, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Notional, Sale of TBAs |  |  | $ 551,897 | $ 574,365 |
Notional, Purchase of TBAs |  |  | 203,439 | 137,572 |
Fair Value, Sale of TBAs | 1,219 | [1] |  | 2,254 | [1]
Fair Value, Purchase of TBAs | $ 4,203 |  |  | $ 5,791 |
[1] | TBAs are used to offset exposures related to commitments to provide funding for FHA loans at OMHHF. At September 30, 2012, the loan commitments balance was $297.5 million ($326.7 million at December 31, 2011). In addition, at September 30, 2012, OMHHF had a loan receivable balance (included in other assets) of $56.3 million ($109.3 million at December 31, 2011) which relates to prior loan commitments that have been funded but have not yet been securitized. The "when issued" securitizations of these loans have been sold to market counter-parties.

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