Servicing - Summary of Mortgage Servicing Rights Capitalized and Amortized (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mortgage servicing rights:      
Mortgage servicing rights, Balance at beginning of year $ 928 $ 533 $ 585
Mortgage servicing rights, Additions 99 708 141
Mortgage servicing rights, Amortization (303) (313) (193)
Mortgage servicing rights, Balance at end of year 724 928 533
Valuation allowance:      
Valuation allowance, Balance at beginning of year 70    
Recoveries (62)    
Provisions   70  
Valuation allowance, Balance at end of year 8 70  
Mortgage servicing assets, net 716 858 533
Fair value of mortgage servicing assets $ 1,517 $ 1,065 $ 533