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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
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Mar. 31, 2014
Other Real Estate Owned [Member]
Dec. 31, 2013
Other Real Estate Owned [Member]
Mar. 31, 2013
Other Real Estate Owned [Member]
Mar. 31, 2014
Purchased Non-Covered Loans [Member]
Dec. 31, 2013
Purchased Non-Covered Loans [Member]
Mar. 31, 2014
Purchased Non-Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Purchased Non-Covered Other Real Estate Owned [Member]
Mar. 31, 2014
Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Covered Other Real Estate Owned [Member]
Mar. 31, 2013
Covered Other Real Estate Owned [Member]
Mar. 31, 2014
Level 3 [Member]
Dec. 31, 2013
Level 3 [Member]
Mar. 31, 2013
Level 3 [Member]
Mar. 31, 2014
Level 3 [Member]
Other Real Estate Owned [Member]
Dec. 31, 2013
Level 3 [Member]
Other Real Estate Owned [Member]
Mar. 31, 2013
Level 3 [Member]
Other Real Estate Owned [Member]
Mar. 31, 2014
Level 3 [Member]
Purchased Non-Covered Loans [Member]
Dec. 31, 2013
Level 3 [Member]
Purchased Non-Covered Loans [Member]
Mar. 31, 2014
Level 3 [Member]
Purchased Non-Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Level 3 [Member]
Purchased Non-Covered Other Real Estate Owned [Member]
Mar. 31, 2014
Level 3 [Member]
Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Level 3 [Member]
Covered Other Real Estate Owned [Member]
Mar. 31, 2013
Level 3 [Member]
Covered Other Real Estate Owned [Member]
Mar. 31, 2014
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Impaired Loans [Member]
Mar. 31, 2014
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Other Real Estate Owned [Member]
Mar. 31, 2014
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Purchased Non-Covered Loans [Member]
Mar. 31, 2014
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Purchased Non-Covered Other Real Estate Owned [Member]
Mar. 31, 2014
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Covered Loans [Member]
Mar. 31, 2014
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Covered Other Real Estate Owned [Member]
Mar. 31, 2014
Level 3 [Member]
Fair Value Measurement, Recurring [Member]
Mar. 31, 2014
Minimum [Member]
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Impaired Loans [Member]
Mar. 31, 2014
Minimum [Member]
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Other Real Estate Owned [Member]
Mar. 31, 2014
Minimum [Member]
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Purchased Non-Covered Loans [Member]
Mar. 31, 2014
Minimum [Member]
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Purchased Non-Covered Other Real Estate Owned [Member]
Mar. 31, 2014
Minimum [Member]
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Covered Loans [Member]
Mar. 31, 2014
Minimum [Member]
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Covered Other Real Estate Owned [Member]
Mar. 31, 2014
Minimum [Member]
Level 3 [Member]
Fair Value Measurement, Recurring [Member]
Mar. 31, 2014
Maximum [Member]
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Impaired Loans [Member]
Mar. 31, 2014
Maximum [Member]
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Other Real Estate Owned [Member]
Mar. 31, 2014
Maximum [Member]
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Purchased Non-Covered Loans [Member]
Mar. 31, 2014
Maximum [Member]
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Purchased Non-Covered Other Real Estate Owned [Member]
Mar. 31, 2014
Maximum [Member]
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Covered Loans [Member]
Mar. 31, 2014
Maximum [Member]
Level 3 [Member]
Fair Value Measurement, Nonrecurring [Member]
Covered Other Real Estate Owned [Member]
Mar. 31, 2014
Maximum [Member]
Level 3 [Member]
Fair Value Measurement, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                                                                                              
Fair Value Disclosure, Nonrecurring $ 931,555 $ 965,056 $ 630,223 $ 33,839 $ 33,351 $ 40,434 $ 437,269 $ 448,753 $ 3,864 $ 4,276 $ 42,636 $ 45,893 $ 77,915 $ 931,555 $ 965,056 $ 630,223 $ 33,839 $ 33,351 $ 40,434 $ 437,269 $ 448,753 $ 3,864 $ 4,276 $ 42,636 $ 45,893 $ 77,915 $ 41,253 $ 33,839 $ 437,269 $ 3,864 $ 372,694 $ 42,636                              
Investment securities available for sale, Recurring $ 508,406 $ 553,513 $ 366,361                     $ 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 Third party appraisals and discounted cash flows Third party appraisals Discounted par values                            
Fair value inputs discount rate range                                                                   4.00% 10.00% 1.00% 15.00% 1.75% 10.00% 0.00% 60.00% 74.00% 40.00% 57.00% 75.00% 87.00% 0.00%