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Business Combinations - Schedule of Changes in Accretable Discounts Related Acquired Non-Covered Loans (Detail) (Non-Covered Loans [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Non-Covered Loans [Member]
   
Schedule Of Covered Loans Acquired Accretable Discounts [Line Items]    
Balance, beginning of year $ 26,189  
Additions due to acquisitions 7,799 26,189
Accretion (3,153)  
Other activity, net 1,486  
Balance, end of year $ 32,321 $ 26,189