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Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 2,741,367 | $ 2,679,727
Gross Unrealized Holding Gain | 45,422 | 38,537
Gross Unrealized Holding Loss | (36,726) | (54,622)
Fair Value | 2,750,063 | 2,663,642
Total Percent | 100.00% | 100.00%
Government agency [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 335,412 | 350,378
Gross Unrealized Holding Gain | 3 | 22
Gross Unrealized Holding Loss | (18,586) | (23,875)
Fair Value | 316,829 | 326,525
Total Percent | 11.52% | 12.26%
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 1,511,226 | 1,391,631
Gross Unrealized Holding Gain | 16,365 | 13,100
Gross Unrealized Holding Loss | (15,415) | (24,788)
Fair Value | 1,512,176 | 1,379,943
Total Percent | 54.99% | 51.81%
CMO's / REMIC's - residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 344,470 | 361,573
Gross Unrealized Holding Gain | 7,466 | 6,576
Gross Unrealized Holding Loss | (563) | (1,974)
Fair Value | 351,373 | 366,175
Total Percent | 12.78% | 13.75%
Municipal bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 545,259 | 571,145
Gross Unrealized Holding Gain | 21,588 | 18,839
Gross Unrealized Holding Loss | (2,162) | (3,893)
Fair Value | 564,685 | 586,091
Total Percent | 20.53% | 22.00%
Other securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 5,000 | 5,000
Gross Unrealized Holding Gain |  |
Gross Unrealized Holding Loss |  | (92)
Fair Value | $ 5,000 | $ 4,908
Total Percent | 0.18% | 0.18%

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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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