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Supplemental Comprehensive Income Disclosures - Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Other Comprehensive Income [Line Items] |  |  |
Unrealized holding (losses) gains on securities arising during the period, Pretax Amount | $ (2,854) | $ 9,727 | $ (8,377)
Noncredit related gains (losses) on securities not expected to be sold, Pretax Amount | 2,193 | (425) | 6,633
Less: reclassification adjustment for (gains) losses on securities included in net income, Pretax Amount | (192) | (2,185) | 6,822
Transition obligation, Pretax Amount | 2 | 2 | 2
Net (loss) gain, Pretax Amount | (300) | (260) | 440
Total other comprehensive (loss) income, Pretax Amount | (1,151) | 6,859 | 5,520
Unrealized holding (losses) gains on securities arising during the period, Tax (Expense) Benefit | 1,006 | (3,404) | 2,931
Noncredit related gains (losses) on securities not expected to be sold, Tax (Expense) Benefit | (768) | 149 | (2,321)
Less: reclassification adjustment for (gains) losses on securities included in net income, Tax (Expense) Benefit | 67 | 765 | (2,388)
Transition obligation, Tax (Expense) Benefit | (1) | (1) | (1)
Net (loss) gain, Tax (Expense) Benefit | 105 | 91 | (154)
Total other comprehensive (loss) income, Tax (Expense) Benefit | 409 | (2,400) | (1,933)
Unrealized holding (losses) gains on securities arising during the period, Net of Tax Amount | (1,848) | 6,323 | (5,446)
Noncredit related gains (losses) on securities not expected to be sold, Net of Tax Amount | 1,425 | (276) | 4,312
Less: reclassification adjustment for (gains) losses on securities included in net income, Net of Tax Amount | (125) | (1,420) | 4,434
Transition obligation, Net of Tax Amount | 2 | 2 | 2
Net (loss) gain, Net of Tax Amount | (300) | (260) | 440
Total other comprehensive (loss) income, Net of Tax Amount | $ (742) | $ 4,459 | $ 3,587

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