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Servicing - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Transfers And Servicing [Abstract]    
Loans serviced for others unpaid principal amount $ 282 $ 280
Capitalized service right assets included in other assets 2.1 2.1
Fair market value of the capitalized servicing rights $ 2.8 $ 2.4
Prepayment rate 11.20% 18.90%
Discount yield 8.25% 7.75%