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Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 2,424,654 | $ 2,374,816
Gross Unrealized Holding Gain | 42,379 | 76,539
Gross Unrealized Holding Loss | (35,452) | (1,968)
Fair Value | 2,431,581 | 2,449,387
Total Percent | 100.00% | 100.00%
Government agency [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 377,493 | 357,960
Gross Unrealized Holding Gain | 62 | 1,588
Gross Unrealized Holding Loss | (16,223) | (248)
Fair Value | 361,332 | 359,300
Total Percent | 14.86% | 14.67%
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 1,040,904 | 862,196
Gross Unrealized Holding Gain | 11,499 | 25,529
Gross Unrealized Holding Loss | (15,303) | (127)
Fair Value | 1,037,100 | 887,598
Total Percent | 42.65% | 36.24%
CMO's / REMIC's - residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 420,465 | 565,968
Gross Unrealized Holding Gain | 6,159 | 7,402
Gross Unrealized Holding Loss | (731) | (1,410)
Fair Value | 425,893 | 571,960
Total Percent | 17.52% | 23.35%
Municipal bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 580,792 | 583,692
Gross Unrealized Holding Gain | 24,659 | 41,920
Gross Unrealized Holding Loss | (3,120) | (183)
Fair Value | 602,331 | 625,429
Total Percent | 24.77% | 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 | (75) |
Fair Value | $ 4,925 | $ 5,100
Total Percent | 0.20% | 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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