Deposits - Summary of Contractual Maturities of Time Deposits (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Banking and Thrift [Abstract]    
2015 $ 107,492  
2016 45,383  
2017 30,051  
2018 16,414  
2019 6,867  
Total $ 206,207 $ 138,063