Loans Receivable - Summary of Changes in Accretable Yields of Acquired Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Loans Receivable [Line Items]
Balance	$ 356,393	$ 470,811
Transfers from nonaccretable difference to accretable yield	18,522	4,380
Accretion	(51,780)	(61,972)
Changes in expected cash flows not affecting nonaccretable differences	73,473	20,755
Balance	396,608	433,974
Acquired Impaired Loans [Member]
Loans Receivable [Line Items]
Balance	76,623	83,834
Transfers from nonaccretable difference to accretable yield	2,042	943
Accretion	(6,499)	(6,275)
Changes in expected cash flows not affecting nonaccretable differences	8,973	(3,014)
Balance	81,139	75,488
Acquired Performing Loans [Member]
Loans Receivable [Line Items]
Balance	279,770	386,977
Transfers from nonaccretable difference to accretable yield	16,480	3,437
Accretion	(45,281)	(55,697)
Changes in expected cash flows not affecting nonaccretable differences	64,500	23,769
Balance	$ 315,469	$ 358,486

The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Current period recognition due to accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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- Definition

Change in the estimate of cash flows expected to be collected, after acquisition of a loan, which results in an increase in accretable yield (for example, if actual cash flows are significantly greater than previously expected). This relates to loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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