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Basic of Presention and Accounting Policies - Summary of Significant Unobservable Inputs Used in Fair Value Measurement of Level 3 Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Sep. 30, 2013
Other Real Estate Owned [Member]
Dec. 31, 2012
Other Real Estate Owned [Member]
Sep. 30, 2012
Other Real Estate Owned [Member]
Sep. 30, 2013
Covered Other Real Estate Owned [Member]
Dec. 31, 2012
Covered Other Real Estate Owned [Member]
Sep. 30, 2012
Covered Other Real Estate Owned [Member]
Sep. 30, 2013
Level 3 [Member]
Dec. 31, 2012
Level 3 [Member]
Sep. 30, 2012
Level 3 [Member]
Sep. 30, 2013
Level 3 [Member]
Other Real Estate Owned [Member]
Dec. 31, 2012
Level 3 [Member]
Other Real Estate Owned [Member]
Sep. 30, 2012
Level 3 [Member]
Other Real Estate Owned [Member]
Sep. 30, 2013
Level 3 [Member]
Covered Other Real Estate Owned [Member]
Dec. 31, 2012
Level 3 [Member]
Covered Other Real Estate Owned [Member]
Sep. 30, 2012
Level 3 [Member]
Covered Other Real Estate Owned [Member]
Sep. 30, 2013
Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Member]
Impaired Loans [Member]
Sep. 30, 2013
Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Member]
Other Real Estate Owned [Member]
Sep. 30, 2013
Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Member]
Covered Loans [Member]
Sep. 30, 2013
Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Member]
Covered Other Real Estate Owned [Member]
Sep. 30, 2013
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Minimum [Member]
Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Member]
Impaired Loans [Member]
Sep. 30, 2013
Minimum [Member]
Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Member]
Other Real Estate Owned [Member]
Sep. 30, 2013
Minimum [Member]
Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Member]
Covered Loans [Member]
Sep. 30, 2013
Minimum [Member]
Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Member]
Covered Other Real Estate Owned [Member]
Sep. 30, 2013
Minimum [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Maximum [Member]
Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Member]
Impaired Loans [Member]
Sep. 30, 2013
Maximum [Member]
Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Member]
Other Real Estate Owned [Member]
Sep. 30, 2013
Maximum [Member]
Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Member]
Covered Loans [Member]
Sep. 30, 2013
Maximum [Member]
Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Member]
Covered Other Real Estate Owned [Member]
Sep. 30, 2013
Maximum [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                                                                  
Fair Value Disclosure, Nonrecurring $ 551,743 $ 688,349 $ 722,891 $ 37,978 $ 39,850 $ 37,325 $ 52,552 $ 88,273 $ 88,895 $ 551,743 $ 688,349 $ 722,891 $ 37,978 $ 39,850 $ 37,325 $ 52,552 $ 88,273 $ 88,895 $ 43,564 $ 37,978 $ 417,649 $ 52,552                      
Investment securities available for sale, Recurring $ 381,882 $ 395,695 $ 390,072             $ 2,000 $ 2,000 $ 2,000                     $ 2,000                    
Valuation Technique                                     Third party appraisals and discounted cash flows Third party appraisals Third party appraisals and discounted cash flows Third party appraisals Discounted par values                    
Fair value inputs discount rate range                                               4.00% 10.00% 1.75% 10.00% 0.00% 75.00% 78.00% 75.00% 84.00% 0.00%