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Investment Securities - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items] |  |  |
Securities issued by U.S. government percentage | 75.00% |  |
Gross realized gain | $ 0 | $ 0 | $ 38,900,000
Gross unrealized holding losses | 0 |  |
Credit-related impairment loss on investment securities held-to-maturity |  | 656,000 | 904,000
Average life of investment grade debt securities, years | 2 years 8 months 12 days |  |
Investment securities pledged as collateral | 2,240,000,000 | 1,850,000,000 |
Government agency [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Agency bond callable | 162,800,000 |  |
CMO's / REMIC's-residential [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
CMO/REMIC's backed by whole loans issued by private-label companies (non-government sponsored) | 1,200,000 |  |
Investment security classified as held-to-maturity, number | 1 |  |
Held-to-Maturity securities, average FICO score | 715 |  |
Held-to-Maturity securities, acquired price, percentage | 98.25% |  |
Average percentage of LTV | 71.00% |  |
Fair value percentage of Held-to-Maturity security against par value | 71.00% |  |
Investment contractual cash flows guaranteed by Government, percentage | 99.92% |  |
Investment contractual cash flows guaranteed by banks, percentage | 0.08% |  |
Alt-A bond [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Book value of the bond | 2,100,000 |  |
Net impairment losses | $ 1,900,000 |  |
Municipal bonds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Average life of investment grade debt securities, years | 9 years 6 months |  |

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- Definition Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 + Details
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