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Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 2,609,959 | $ 2,374,816
Gross Unrealized Holding Gain | 48,493 | 76,539
Gross Unrealized Holding Loss | (41,145) | (1,968)
Fair Value | 2,617,307 | 2,449,387
Total Percent | 100.00% | 100.00%
Government agency [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 353,580 | 357,960
Gross Unrealized Holding Gain | 36 | 1,588
Gross Unrealized Holding Loss | (20,603) | (248)
Fair Value | 333,013 | 359,300
Total Percent | 12.72% | 14.67%
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 1,286,448 | 862,196
Gross Unrealized Holding Gain | 19,249 | 25,529
Gross Unrealized Holding Loss | (16,073) | (127)
Fair Value | 1,289,624 | 887,598
Total Percent | 49.28% | 36.24%
CMO/REMICs [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 383,268 | 565,968
Gross Unrealized Holding Gain | 7,002 | 7,402
Gross Unrealized Holding Loss | (1,062) | (1,410)
Fair Value | 389,208 | 571,960
Total Percent | 14.87% | 23.35%
Municipal bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 581,663 | 583,692
Gross Unrealized Holding Gain | 22,206 | 41,920
Gross Unrealized Holding Loss | (3,145) | (183)
Fair Value | 600,724 | 625,429
Total Percent | 22.95% | 25.53%
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 5,000 | 5,000
Gross Unrealized Holding Gain |  | 100
Gross Unrealized Holding Loss | (262) |
Fair Value | $ 4,738 | $ 5,100
Total Percent | 0.18% | 0.21%

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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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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