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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | $ 3,156,146 | $ 2,956,381
Held to Maturity, Gross Unrealized Gains | 30,270 | 45,556
Held to Maturity, Gross Unrealized Losses | 133,504 | 4,993
Held to Maturity, Estimated Fair Value | 3,052,912 | 2,996,944
Available for Sale, Amortized Cost | 5,452,986 | 5,990,577
Available for Sale, Gross Unrealized Gains | 122,936 | 212,747
Available for Sale, Gross Unrealized Losses | 6,131 | 25
Available for Sale, Estimated Fair Value | 5,569,791 | 6,203,299
U.S. Treasury [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 248,488 | 248,188
Held to Maturity, Gross Unrealized Gains | 22,039 | 29,859
Held to Maturity, Gross Unrealized Losses | 0 | 0
Held to Maturity, Estimated Fair Value | 270,527 | 278,047
Available for Sale, Amortized Cost | 2,521,612 | 3,020,115
Available for Sale, Gross Unrealized Gains | 22,449 | 37,806
Available for Sale, Gross Unrealized Losses | 0 | 0
Available for Sale, Estimated Fair Value | 2,544,061 | 3,057,921
Residential mortgage- backed securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 9,868 | 10,725
Held to Maturity, Gross Unrealized Gains | 101 | 300
Held to Maturity, Gross Unrealized Losses | 57 | 0
Held to Maturity, Estimated Fair Value | 9,912 | 11,025
Available for Sale, Amortized Cost | 1,828,500 | 2,382,514
Available for Sale, Gross Unrealized Gains | 78,336 | 135,514
Available for Sale, Gross Unrealized Losses | 1,026 | 25
Available for Sale, Estimated Fair Value | 1,905,810 | 2,518,003
States and political subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 2,896,790 | 2,696,468
Held to Maturity, Gross Unrealized Gains | 8,130 | 15,397
Held to Maturity, Gross Unrealized Losses | 133,446 | 4,993
Held to Maturity, Estimated Fair Value | 2,771,474 | 2,706,872
Available for Sale, Amortized Cost | 1,066,966 | 552,056
Available for Sale, Gross Unrealized Gains | 22,151 | 39,427
Available for Sale, Gross Unrealized Losses | 5,105 | 0
Available for Sale, Estimated Fair Value | 1,084,012 | 591,483
Other [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 1,000 | 1,000
Held to Maturity, Gross Unrealized Gains | 0 | 0
Held to Maturity, Gross Unrealized Losses | 1 | 0
Held to Maturity, Estimated Fair Value | 999 | 1,000
Available for Sale, Amortized Cost | 35,908 | 35,892
Available for Sale, Gross Unrealized Gains | 0 | 0
Available for Sale, Gross Unrealized Losses | 0 | 0
Available for Sale, Estimated Fair Value | $ 35,908 | $ 35,892

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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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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -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 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Amount of unrecognized gain before loss on investments in held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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