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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, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Mortgage Backed Securities [Member] | Sep. 30, 2013 Mortgage Backed Securities [Member] | Sep. 30, 2014 US Government Agencies Residential Mortgage-backed Securities [Member] | Dec. 31, 2013 US Government Agencies Residential Mortgage-backed Securities [Member] | Sep. 30, 2014 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
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Investment Securities [Line Items] |  |  |  |  |  |  |  |  |
Due within one year, Amortized Cost | $ 2,600 |  |  |  |  |  |  |  |
Due after one but within five years, Amortized Cost | 266,577 |  |  |  |  |  |  |  |
Due after five but within ten years, Amortized Cost | 11,224 |  |  |  |  |  |  |  |
Due after ten years, Amortized Cost | 56,853 |  |  |  |  |  |  |  |
Debt securities gross, Amortized Cost | 337,254 |  |  |  |  |  |  |  |
Corporate/Mortgage-Backed Securities, Amortized cost | 1,348,063 | 1,350,466 | 1,009,389 | [1] | 1,007,226 | [1] | 21,780 | 22,639 | 987,600
Debt Securities, Amortized Cost | 1,346,643 |  |  |  |  |  |  |  |
Due within one year, Estimated Fair Value | 2,600 |  |  |  |  |  |  |  |
Due after one but within five years, Estimated Fair Value | 265,117 |  |  |  |  |  |  |  |
Due after five but within ten years, Estimated Fair Value | 11,373 |  |  |  |  |  |  |  |
Due after ten years, Estimated Fair Value | 45,038 |  |  |  |  |  |  |  |
Debt securities gross, Estimated Fair Value | 324,128 |  |  |  |  |  |  |  |
Total Debt Securities, Estimated Fair Value | $ 1,331,354 |  |  |  |  |  |  |  |
[1] | Mortgage Backed Securities include an amortized cost of $21.8 million and a fair value of $24.4 million for Obligations of U.S.

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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 + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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