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Allowance for Loan Losses - Additional Information (Detail)
3 Months Ended
Mar. 31, 2014
Scenario, Actual [Member]
 
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Actual loss history experienced by the Company 5 years
Minimum [Member]
 
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Actual loss history experienced by the Company 1 year
Maximum [Member]
 
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Actual loss history experienced by the Company 5 years
Allowance for loan losses charge down family first and junior lien mortgages past due period 180 days
Allowance for loan losses charge down unsecured open end loans past due period 90 days
Allowance for loan losses charge down other secured loans past due period 90 days