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Investment Securities - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 Securities | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Securities issued by U.S. government percentage | 77.00% |  |  | 77.00% |  |
Number of securities |  |  | 13 |  |  |
Investment securities, par value |  |  | $ 94,200,000 |  |  |
Pre-tax gain on sale of securities |  |  | $ 2,100,000 | $ 2,094,000 |  |
Gains (loss) recognized | 0 | 0 |  |  |  |
Investment securities purchased | 314,700,000 |  |  |  |  |
Gross unrealized holding losses | 0 |  |  | 0 |  |
Book value of the bond | 1,850,000 |  |  | 1,850,000 |  | 2,050,000
Credit-related impairment loss on investment securities held-to-maturity | 0 |  |  |  | 0 |
Average life of investment grade debt securities, years |  |  |  | 4 years 9 months 18 days |  |
Investment securities pledged as collateral | 2,610,000,000 |  |  | 2,610,000,000 |  | 2,240,000,000
Government agency [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Agency bond callable |  |  |  | 144,400,000 |  |
CMO/REMICs [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
CMO/REMIC's backed by whole loans issued by private-label companies (non-government sponsored) | 679,000 |  |  | 679,000 |  | 1,200,000
Investment security classified as held-to-maturity, number | 1 |  |  | 1 |  |
Held-to-Maturity securities, average FICO score | 715 |  |  | 715 |  |
Held-to-Maturity securities, acquired price, percentage | 98.25% |  |  | 98.25% |  |
Average percentage of LTV | 71.00% |  |  | 71.00% |  |
Current fair value percentage of Held-to-Maturity security against par value | 73.00% |  |  | 73.00% |  |
Investment contractual cash flows guaranteed by Government, percentage | 99.96% |  |  | 99.96% |  |
Investment contractual cash flows guaranteed by banks, percentage | 0.04% |  |  | 0.04% |  |
Alt-A bond [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Book value of the bond | 1,800,000 |  |  | 1,800,000 |  |
Net impairment losses | $ 1,900,000 |  |  | $ 1,900,000 |  |
Municipal bonds [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Average life of investment grade debt securities, years |  |  |  | 8 years 10 months 24 days |  |

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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 Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (dd) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5086-111524 + Details
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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph h -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Article 7 + Details
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- Definition Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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