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Fair Value of Financial Instruments - Summary of Significant Unobservable Inputs Used in the Fair Value Measurement of Level 3 Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Other Real Estate Owned [Member]
Dec. 31, 2012
Other Real Estate Owned [Member]
Dec. 31, 2013
Purchased Non-Covered Loans [Member]
Dec. 31, 2013
Purchased Non-Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Covered Loans [Member]
Dec. 31, 2012
Covered Loans [Member]
Dec. 31, 2013
Covered Other Real Estate Owned [Member]
Dec. 31, 2012
Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Level 3 [Member]
Dec. 31, 2012
Level 3 [Member]
Dec. 31, 2013
Level 3 [Member]
Other Real Estate Owned [Member]
Dec. 31, 2012
Level 3 [Member]
Other Real Estate Owned [Member]
Dec. 31, 2013
Level 3 [Member]
Purchased Non-Covered Loans [Member]
Dec. 31, 2013
Level 3 [Member]
Purchased Non-Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Level 3 [Member]
Covered Loans [Member]
Dec. 31, 2012
Level 3 [Member]
Covered Loans [Member]
Dec. 31, 2013
Level 3 [Member]
Covered Other Real Estate Owned [Member]
Dec. 31, 2012
Level 3 [Member]
Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Impaired Loans [Member]
Dec. 31, 2013
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Other Real Estate Owned [Member]
Dec. 31, 2013
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Purchased Non-Covered Loans [Member]
Dec. 31, 2013
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Purchased Non-Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Covered Loans [Member]
Dec. 31, 2013
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2013
Minimum [Member]
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Impaired Loans [Member]
Dec. 31, 2013
Minimum [Member]
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Other Real Estate Owned [Member]
Dec. 31, 2013
Minimum [Member]
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Purchased Non-Covered Loans [Member]
Dec. 31, 2013
Minimum [Member]
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Purchased Non-Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Minimum [Member]
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Covered Loans [Member]
Dec. 31, 2013
Minimum [Member]
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Minimum [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2013
Maximum [Member]
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Impaired Loans [Member]
Dec. 31, 2013
Maximum [Member]
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Other Real Estate Owned [Member]
Dec. 31, 2013
Maximum [Member]
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Purchased Non-Covered Loans [Member]
Dec. 31, 2013
Maximum [Member]
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Purchased Non-Covered Other Real Estate Owned [Member]
Dec. 31, 2013
Maximum [Member]
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Covered Loans [Member]
Dec. 31, 2013
Maximum [Member]
Level 3 [Member]
Fair Value, Measurement, Nonrecurring [Member]
Covered Other Real Estate Owned [Member]
Dec. 31, 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 $ 965,056 $ 688,349 $ 33,351 $ 39,850 $ 448,753 $ 4,276 $ 390,237 $ 507,712 $ 45,893 $ 88,273 $ 965,056 $ 688,349 $ 33,351 $ 39,850 $ 448,753 $ 4,276 $ 390,237 $ 507,712 $ 45,893 $ 88,273 $ 42,546 $ 33,351 $ 448,753 $ 4,276 $ 390,237 $ 45,893                              
Investment securities available for sale, Recurring $ 553,513 $ 395,695                 $ 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% 75.00% 74.00% 40.00% 63.00% 75.00% 86.00% 0.00%