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Loan Servicing - Additional Information (Detail) (USD $) | 12 Months Ended
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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)

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- Definition Additional impairment. + References No definition available. + Details
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- Definition Capitalized mortgage service right fair value. + References No definition available. + Details
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- Definition Finite lived mortgage servicing rights net of impairment. + References No definition available. + Details
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- Definition Principal amount of service loan outstanding. + References No definition available. + Details
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- Details
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