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Loan Servicing - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Receivables [Abstract]      
Unpaid principal balances of loans serviced for others totaled $ 943,100,000 $ 772,100,000  
Aggregate fair value of capitalized mortgage servicing rights 9,900,000 6,600,000 5,400,000
Mortgage servicing rights, net 7,039,000 5,145,000 4,193,000
Bank recorded additional impairment $ 635,000 $ (168,000) $ (53,000)