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Other Real Estate Owned - Schedule of Other Real Estate Owned Segregated into Covered and Non-Covered Properties (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Real Estate Properties [Line Items]    
Real estate owned acquired by foreclosure $ 121,262 $ 110,864
Real estate acquired for development or resale 9,199 9,199
Other foreclosed property 1,375 1,473
Total other real estate owned and foreclosed property 131,836 121,536
Non-covered properties [Member]
   
Real Estate Properties [Line Items]    
Real estate owned acquired by foreclosure 33,391 35,080
Real estate acquired for development or resale 9,199 9,199
Other foreclosed property 48 14
Total other real estate owned and foreclosed property 42,638 44,293
Covered properties [Member]
   
Real Estate Properties [Line Items]    
Real estate owned acquired by foreclosure 87,871 75,784
Real estate acquired for development or resale      
Other foreclosed property 1,327 1,459
Total other real estate owned and foreclosed property $ 89,198 $ 77,243