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Information for Financial Instruments on Which Fair Value Option was Elected (Parenthetical) (Detail)
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3 Months Ended | 12 Months Ended |
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Mar. 31, 2015
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Dec. 31, 2014
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| Fair Value, Option, Quantitative Disclosures [Line Items] | ||
| Loans and bonds contractual payment past due, number days | 1 day | 1 day |