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Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Investment securities available-for-sale: Before-Tax |  |  |
Net change in fair value recorded in accumulated OCI, Before-Tax | $ (88,562) | $ 3,074 | $ 61,490
Net realized gains reclassified into earnings, Before-Tax | (2,094) |  | (656)
Other comprehensive (loss) income, before tax | (90,656) | 3,074 | 60,834
Net change in fair value recorded in accumulated OCI, Before-Tax | (88,562) | 3,074 | 61,490
Investment securities available-for-sale: Tax Effect |  |  |
Net change in fair value recorded in accumulated OCI, Tax Effect | (37,196) | 1,292 | 25,826
Net realized gains reclassified into earnings, Tax Effect | (879) |  |
Net change, Tax Effect | (38,075) | 1,292 | 25,550
Investment securities held-to-maturity: Before-Tax |  |  |
Reclassification of credit-related OTTI from accumulated OCI, Before-Tax |  |  | (656)
Investment securities available-for-sale: After-Tax |  |  |
Net change in fair value recorded in accumulated OCI, After-Tax | (51,366) | 1,782 | 35,664
Net realized gains reclassified into earnings, After-Tax | (1,215) |  |
Other comprehensive (loss) income, net of tax | (52,581) | 1,782 | 35,284
Other comprehensive (loss) income, before tax | (90,656) | 3,074 | 60,834
Net change in fair value recorded in accumulated OCI, Tax Effect | (37,196) | 1,292 | 25,826
Investment securities held-to-maturity: Tax Effect |  |  |
Reclassification of credit-related OTTI from accumulated OCI, Tax Effect |  |  | (276)
Net change, Tax Effect | (38,075) | 1,292 | 25,550
Net change in fair value recorded in accumulated OCI, After-Tax | (51,366) | 1,782 | 35,664
Investment securities held-to-maturity: After-Tax |  |  |
Reclassification of credit-related OTTI from accumulated OCI, After-Tax |  |  | (380)
Other comprehensive (loss) income, net of tax | $ (52,581) | $ 1,782 | $ 35,284

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- Definition Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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- Definition Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580 + Details
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- Definition Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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