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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Mortgage Backed Securities [Member] | Sep. 30, 2012 Mortgage Backed Securities [Member] | Sep. 30, 2013 US Government Agencies Residential Mortgage-backed Securities [Member] | Dec. 31, 2012 US Government Agencies Residential Mortgage-backed Securities [Member] | Sep. 30, 2013 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
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Investment Securities [Line Items] |  |  |  |  |  |  |  |  |
Due within one year, Amortized Cost | $ 28,081 |  |  |  |  |  |  |  |
Due after one but within five years, Amortized Cost | 239,969 |  |  |  |  |  |  |  |
Due after five but within ten years, Amortized Cost | 0 |  |  |  |  |  |  |  |
Due after ten years, Amortized Cost | 55,521 |  |  |  |  |  |  |  |
Debt securities gross, Amortized Cost | 323,571 |  |  |  |  |  |  |  |
Corporate/Mortgage-Backed Securities, Amortized cost | 1,321,239 | 1,169,613 | 996,248 | [1] | 990,800 | [1] | 23,787 | 27,883 | 972,500
Debt Securities, Amortized Cost | 1,319,819 |  |  |  |  |  |  |  |
Due within one year, Estimated Fair Value | 28,215 |  |  |  |  |  |  |  |
Due after one but within five years, Estimated Fair Value | 238,170 |  |  |  |  |  |  |  |
Due after five but within ten years, Estimated Fair Value | 0 |  |  |  |  |  |  |  |
Due after ten years, Estimated Fair Value | 32,458 |  |  |  |  |  |  |  |
Debt securities gross, Estimated Fair Value | 298,843 |  |  |  |  |  |  |  |
Total Debt Securities, Estimated Fair Value | $ 1,289,643 |  |  |  |  |  |  |  |
[1] | Mortgage Backed Securities include an amortized cost of $23.8 million and a fair value of $26.5 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $972.5 million and a fair value of $964.3 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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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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