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Commitments and Off-Balance Sheet Risk - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]    
Line of credit facilities 1 year  
Libor rate period 30 days  
Fixed rate range of term debt secured by real estate, Maximum 4.00%  
Fixed rate range of term debt secured by real estate, Maximum 7.00%  
Term debt secured by real estate balloon payment period 5 years  
Term debt secured by non real estate collateral maturity period 5 years  
Remaining amount of fees collected from customers relating to risk participation agreements associated with interest rate swap agreements, reflected as liabilities $ 0.1 $ 0.1
Amount of federal reserve requirement 1.5 1.2
Interest rate swap agreement [Member]
    
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]    
Notional amount of the underlying interest rate swap agreements, entered into by commercial loan customers with correspondent banks 17.9  
Net fair value of interest rate swaps entered into by commercial loan customer's with correspondent banks $ (2.3)  
Minimum [Member]
    
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]    
Amortization period for term debt secured by real estate 10 years  
Interest rates on loans secured by non real estate collateral 4.00%  
Income recognition period for risk participation agreement fees collected from customers entering into interest rate swap agreements with correspondent banks 4 years  
Maximum [Member]
    
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]    
Amortization period for term debt secured by real estate 20 years  
Interest rates on loans secured by non real estate collateral 7.50%  
Income recognition period for risk participation agreement fees collected from customers entering into interest rate swap agreements with correspondent banks 15 years