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Impairment of Investment Securities - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 Bank | Sep. 30, 2011 | Sep. 30, 2012 Security Bank | Sep. 30, 2011 | Dec. 31, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Corporate/Mortgage-Backed Securities, Amortized cost | $ 1,123,728,000 |  |  |  | $ 1,123,728,000 |  |  |  | $ 1,140,212,000
Corporate/Mortgage-Backed Securities, Estimated fair value | 1,130,822,000 |  |  |  | 1,130,822,000 |  |  |  | 1,142,776,000
Gross unrealized loss | (29,645,000) |  |  |  | (29,645,000) |  |  |  |
Available for sale securities book value | 52,696,000 |  |  |  | 52,696,000 |  |  |  |
Number of banks and other financial institutions comprising the security | 339 |  |  |  | 339 |  |  |  |
Number of pooled securities representing senior tranches |  |  |  |  | 2 |  |  |  |
Amount of pooled issues that remained above investment grade | 2,900,000 |  |  |  | 2,900,000 |  |  |  |
Amount of book value of the pooled issues | 52,700,000 |  |  |  | 52,700,000 |  |  |  |
Collateral issued by financial institutions | 15,000,000,000 |  |  |  | 15,000,000,000 |  |  |  |
Estimate of future cash flows prepayment percentage in year three |  |  |  |  | 20.00% |  |  |  |
Estimate of future cash flows prepayment percentage year four |  |  |  |  | 20.00% |  |  |  |
Estimate of future cash flows prepayment percentage thereafter |  |  |  |  | 2.00% |  |  |  |
Probability of default |  |  |  |  | 100.00% |  |  |  |
Projected recovery rate |  |  |  |  | 0.00% |  |  |  |
Probability percentage assigned to default bank subject to market indicators |  |  |  |  | 10.00% |  |  |  |
Probability percentage assigned to default bank |  |  |  |  | 100.00% |  |  |  |
Excess recognized as an adjustment to yield | 436,000 | [1] | 0 | [1] | 942,000 | [1] | 0 | [1] |
Minimum [Member] |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Subordinated tranches range | 7.00% |  |  |  | 7.00% |  |  |  |
Total principal amount of the respective securities | 5.00% |  |  |  | 5.00% |  |  |  |
Excess subordination as a percentage of current performing collateral |  |  |  |  | 10.00% |  |  |  |
Probabilities for performing collateral range |  |  |  |  | 0.33% |  |  |  |
Excess present value of future cash flows over our current book value |  |  |  |  | 14.00% |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Subordinated tranches range | 35.00% |  |  |  | 35.00% |  |  |  |
Excess subordination as a percentage of current performing collateral |  |  |  |  | 566.00% |  |  |  |
Probabilities for performing collateral range |  |  |  |  | 75.00% |  |  |  |
Excess present value of future cash flows over our current book value |  |  |  |  | 144.00% |  |  |  |
Trust preferred collateralized debt obligations [Member] |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Non-credit related losses on securities |  |  |  |  |  |  | 200,000 |  |
Non-credit related gains on securities |  |  |  |  | 1,500,000 |  |  |  |
Corporate/Mortgage-Backed Securities, Estimated fair value | 23,100,000 |  |  |  | 23,100,000 |  |  |  |
Available for sale securities book value | 52,700,000 |  |  |  | 52,700,000 |  |  |  |
Percentage of Current Performing Collateral | 0.00% |  |  |  | 0.00% |  |  |  |
Corporate Securities [Member] |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Corporate/Mortgage-Backed Securities, Amortized cost | 10,800,000 |  |  |  | 10,800,000 |  |  |  | 11,800,000
Corporate/Mortgage-Backed Securities, Estimated fair value | 11,100,000 |  |  |  | 11,100,000 |  |  |  | 11,400,000
Gross unrealized loss | $ 0 |  |  |  | $ 0 |  |  |  | $ 600,000
[1] | Represents the increase in cash flows recognized in interest income during the period.

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 3: 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 Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph e -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 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818 + Details
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- Definition This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held due to increases in cash flows expected to be collected and recognized over the remaining life of the security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27340-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 18B -Subparagraph f -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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