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Loans (Summary of Company's Carrying Value of Non-Accrual TDR's) (Detail) (Non-Accruing TDR [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Covered Loans [Member]
   
Loans [Line Items]    
Carrying value of non-accrual TDR's $ 3,563   
Covered Loans [Member] | Commercial [Member]
   
Loans [Line Items]    
Carrying value of non-accrual TDR's 1,736  
Covered Loans [Member] | Commercial Real Estate [Member]
   
Loans [Line Items]    
Carrying value of non-accrual TDR's 313  
Covered Loans [Member] | Residential Real Estate [Member]
   
Loans [Line Items]    
Carrying value of non-accrual TDR's 1,514  
Non-Covered Loan [Member]
   
Loans [Line Items]    
Carrying value of non-accrual TDR's 9,308 16,288
Non-Covered Loan [Member] | Commercial [Member]
   
Loans [Line Items]    
Carrying value of non-accrual TDR's 1,215 119
Non-Covered Loan [Member] | Commercial Real Estate [Member]
   
Loans [Line Items]    
Carrying value of non-accrual TDR's 6,823 16,108
Non-Covered Loan [Member] | Agriculture [Member]
   
Loans [Line Items]    
Carrying value of non-accrual TDR's 21  
Non-Covered Loan [Member] | Residential Real Estate [Member]
   
Loans [Line Items]    
Carrying value of non-accrual TDR's 958 61
Non-Covered Loan [Member] | Consumer [Member]
   
Loans [Line Items]    
Carrying value of non-accrual TDR's $ 291