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Carrying Amount of Loans Included in Balance Sheet Amounts of Loans Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Business Acquisition [Line Items]  
Carrying amount of loans acquired $ 65,600
Commercial and industrial
 
Business Acquisition [Line Items]  
Carrying amount of loans acquired 8,542
Agriculture production financing and other loans
 
Business Acquisition [Line Items]  
Carrying amount of loans acquired 1,127
Construction
 
Business Acquisition [Line Items]  
Carrying amount of loans acquired 58
Commercial and farm land
 
Business Acquisition [Line Items]  
Carrying amount of loans acquired 24,259
Residential
 
Business Acquisition [Line Items]  
Carrying amount of loans acquired 12,118
Home Equity
 
Business Acquisition [Line Items]  
Carrying amount of loans acquired 18,805
Consumer
 
Business Acquisition [Line Items]  
Carrying amount of loans acquired $ 691