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Goodwill and Other Intangible Assets - Summary of Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]      
Balance of intangible assets, Gross CDI Carrying Amount, Beginning of period $ 34,089 $ 31,999  
Additions due to acquisitions 0 2,090  
Balance of intangible assets, Gross CDI Carrying Amount, End of period 34,089 34,089 $ 31,999
Aggregate amortization expense, Gross CDI Carrying Amount 949 1,137 1,127
Estimated Amortization Expense:      
Estimated Amortization Expense, 2016 737    
Estimated Amortization Expense, 2017 631    
Estimated Amortization Expense, 2018 562    
Estimated Amortization Expense, 2019 335    
Estimated Amortization Expense, Thereafter 0    
Balance of intangible assets, Accumulated Amortization, Beginning of period (30,875) (29,738)  
Balance of intangible assets, Accumulated Amortization, End of period (31,824) (30,875) (29,738)
Balance of intangible assets, Net CDI Amount, Beginning of period 3,214 2,261  
Balance of intangible assets, Net CDI Amount, End of period $ 2,265 $ 3,214 $ 2,261