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Mortgage-Backed Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013 Other Forward Purchase Commitments	Dec. 31, 2012 Other Forward Purchase Commitments	Mar. 31, 2013 Minimum	Mar. 31, 2013 Maximum
Investments Classified by Contractual Maturity Date [Line Items]
Contractual maturity of Company's agency securities, in years			15 years	30 years
Derivatives	$ 2,318	$ 3,305

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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