Other Commitments and Contingencies and Derivatives - Fair Values of Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Total, Asset, Fair Value $ 177 $ 288
Total, Liability, Fair Value 89 12
Derivative Loan Commitments [Member]
   
Derivatives, Fair Value [Line Items]    
Total, Asset, Fair Value 13 288
Total, Liability, Fair Value     
Derivative Loan Commitments [Member] | Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Total, Asset, Fair Value 38 288
Derivative Loan Commitments [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Total, Liability, Fair Value 25  
Forward Loan Sale Commitments [Member]
   
Derivatives, Fair Value [Line Items]    
Total, Asset, Fair Value 75   
Total, Liability, Fair Value   12
Forward Loan Sale Commitments [Member] | Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Total, Asset, Fair Value 82  
Forward Loan Sale Commitments [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Total, Liability, Fair Value 7 12
Loan Level Interest Rate Swaps [Member] | Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Total, Asset, Fair Value 57  
Loan Level Interest Rate Swaps [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Total, Liability, Fair Value $ 57