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Amount and Market Value of Mortgage Banking Derivatives (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Other Assets
   
Derivatives, Fair Value [Line Items]    
Notional Amount Assets $ 424,730 $ 421,347
Fair Value Assets 4,469 5,493
Other Assets | Interest rate lock commitments
   
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 135,421 129,010
Fair Value Assets 4,140 3,962
Other Assets | Mandatory commitments
   
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 239,309 242,337
Fair Value Assets 320 1,305
Other Assets | Interest Rate Swap
   
Derivatives, Fair Value [Line Items]    
Notional Amount Assets 50,000 50,000
Fair Value Assets 9 226
Other Liabilities
   
Derivatives, Fair Value [Line Items]    
Notional Amount Liability 6,450  
Fair Value Liability 64  
Other Liabilities | Interest rate lock commitments
   
Derivatives, Fair Value [Line Items]    
Notional Amount Liability 6,450  
Fair Value Liability $ 64