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Disclosures about Fair Value of Assets and Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Fair Value Disclosures [Abstract] |  |
Reduction in carrying amount of mortgage servicing rights | $ 389.0 | $ 1.0

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- Definition Reduction in carrying amount of mortgage servicing rights. + References No definition available. + Details
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- Details
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