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Loan Servicing - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 01, 2013
Receivables [Abstract]        
Unpaid principal balances of loans serviced for others totaled $ 1,164,300 $ 1,035,500    
Aggregate fair value of capitalized mortgage servicing rights 10,800 10,500 $ 9,900 $ 6,600
Mortgage servicing rights, net 8,874 7,642 7,039  
Bank recorded additional (impairment) $ (59) $ 51 $ 635