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Commitments and Contingent Liabilities - Additional Information (Detail) (USD $)
 9 Months Ended
Sep. 30, 2014
plaintiff
complaint
Dec. 31, 2013
Loss Contingencies [Line Items]    
Notional amount of financial standby letters of credit $ 291,000  
Notional amount of performance standby letters of credit 800,000  
Notional amount of commercial letters of credit 172,000  
Financial instrument of credit risk 100,000 100,000
Number of new complaints 3  
Loss Contingency, Number of Plaintiffs 36  
Unused commitments and letters of credit [Member]
    
Loss Contingencies [Line Items]    
Unfunded commitment liability 2,900,000 3,200,000
Other Matters [Member]
    
Loss Contingencies [Line Items]    
Contingency reserve 100,000 800,000
Loss Contingency Paid 400,000  
Accrued Loss Contingency Relieved 300,000  
Other Matters [Member] | Minimum [Member]
    
Loss Contingencies [Line Items]    
Number of customers affected (in customers) 700  
Other Matters [Member] | Maximum [Member]
    
Loss Contingencies [Line Items]    
Number of customers affected (in customers) 900  
Pending Litigation [Member]
    
Loss Contingencies [Line Items]    
Percentage Of Interest Rate On Deposits 3.50%  
Number of Former Plaintiffs 34  
Specified Average Age of Plaintiffs 62  
Original Plaintiff [Member]
    
Loss Contingencies [Line Items]    
Loss Contingency, Damages Sought, Value 500,000  
Original Plaintiff's Adult Children [Member]
    
Loss Contingencies [Line Items]    
Loss Contingency, Damages Sought, Value 800,000  
Jarrett [Member] | Pending Litigation [Member]
    
Loss Contingencies [Line Items]    
Loss Contingency, Number of Plaintiffs 8  
Young [Member] | Pending Litigation [Member]
    
Loss Contingencies [Line Items]    
Loss Contingency, Number of Plaintiffs 12  
Fisanik [Member] | Pending Litigation [Member]
    
Loss Contingencies [Line Items]    
Loss Contingency, Number of Plaintiffs 14  
Ira Market Rate For Savings Account [Member] | Pending Litigation [Member]
    
Loss Contingencies [Line Items]    
Percentage Of Interest Rate On Deposits 8.00%  
Market Rate Savings Balance $ 4,000,000