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Comprehensive Income and Accumulated Other Comprehensive Income - Components of Pretax and Related Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax (expense) benefit | $ (3,003) | $ (588) | $ (5,232) | $ (2,460)
Amounts reclassified from accumulated other comprehensive income, net of taxes | (388) |  | (262) |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income, before tax | 597 | (63) | 403 | (1,135)
Income tax (expense) benefit | 209 | (22) | 141 | (397)
Amounts reclassified from accumulated other comprehensive income, net of taxes | 388 | (41) | 262 | (738)
Changes in Net Unrealized Gains on Investment Securities Having No Credit Losses Recognized in the Consolidated Statement of Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of taxes | (388) |  | (262) |
Changes in Net Unrealized Gains on Investment Securities Having No Credit Losses Recognized in the Consolidated Statement of Income [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income, before tax | 597 | (63) | 403 | (1,136)
Income tax (expense) benefit | 209 | (22) | 141 | (397)
Amounts reclassified from accumulated other comprehensive income, net of taxes | 388 | (41) | 262 | (739)
Changes in Net Unrealized Gains on Investment Securities Having Credit Losses Recognized in the Consolidated Statement of Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of taxes |  |  |  |
Changes in Net Unrealized Gains on Investment Securities Having Credit Losses Recognized in the Consolidated Statement of Income [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income, before tax |  |  |  | 1
Income tax (expense) benefit |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of taxes |  |  |  | $ 1

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount before tax of reclassification adjustments of other comprehensive income (loss). + References No definition available. + Details
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- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). + References No definition available. + Details
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