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Assets Acquired In FDIC-Assisted Acquisitions - Loan-By-Loan Basis Performance of Fair Value Adjustments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Adjustments needed where the Company's initial estimate of cash flows were underestimated: (recorded with a reclassification from non-accretable difference to accretable discount)	$ 23,050	$ 22,031
Adjustments needed where the Company's initial estimate of cash flows were overstated: (recorded through a provision for loan losses)	13,190	11,940
Adjustments needed where the Company's initial estimate of cash flows were underestimated: (recorded with a reclassification from non-accretable difference to accretable discount)	4,610	4,406
Adjustments needed where the Company's initial estimate of cash flows were overstated: (recorded through a provision for loan losses)	$ 2,638	$ 2,388

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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