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Purchase Credit Impaired ("PCI") Loans - Summary of Covered Loans by Category (Details) (Covered Loans, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Covered Loans [Line Items]    
Recorded Investment PCI Loans $ 113,862 $ 140,538
Construction and land development
   
Covered Loans [Line Items]    
Weighted- Average Risk Rating 6.33 6.84
Recorded Investment PCI Loans 7,842 14,325
Commercial real estate - Investor owned
   
Covered Loans [Line Items]    
Weighted- Average Risk Rating 7.17 6.81
Recorded Investment PCI Loans 39,275 48,146
Commercial real estate - Owner occupied
   
Covered Loans [Line Items]    
Weighted- Average Risk Rating 6.50 6.75
Recorded Investment PCI Loans 29,922 32,525
Residential real estate
   
Covered Loans [Line Items]    
Weighted- Average Risk Rating 5.94 5.92
Recorded Investment PCI Loans 30,289 34,498
Real Estate Loans
   
Covered Loans [Line Items]    
Recorded Investment PCI Loans 107,328 129,494
Commercial and industrial
   
Covered Loans [Line Items]    
Weighted- Average Risk Rating 7.04 6.87
Recorded Investment PCI Loans 6,103 9,271
Consumer and other
   
Covered Loans [Line Items]    
Weighted- Average Risk Rating 4.30 6.47
Recorded Investment PCI Loans $ 431 $ 1,773