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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Loss Contingencies [Line Items]    
Letters of credit expiration period 1 year  
Loss contingency for unfunded loan commitments $ 2.0 $ 1.3
Percentage of first liens initial loan to value ratio 75.00% 75.00%
Percent of commercial real estate loans owner occupied 46.00% 48.00%
Total loans unsecured 4.00% 4.00%
Qualifying Employee Termination Annual Base Salary Multiplier (percentage) 200.00%  
Qualifying Employee Termination Annual Bonus Multiplier (percentage) 200.00%  
Qualifying Employee Termination Period For Health Premium Reimbursement 24 months  
Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Credit Concentration Risk [Member]
   
Loss Contingencies [Line Items]    
Percent of commercial real estate related loans 58.00% 58.00%
Commercial Real Estate Secured By Undeveloped Land [Member] | Loans Receivable [Member] | Credit Concentration Risk [Member]
   
Loss Contingencies [Line Items]    
Percent of commercial real estate related loans 2.00% 3.00%