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Securities - Securities, with Unrealized Losses Segregated by Length of Impairment (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013
Schedule of Available-for-Sale Securities [Line Items] |
Held to Maturity, Less than 12 Months, Estimated Fair Value | $ 2,350,297
Held to Maturity, Less than 12 Months, Unrealized Losses | 133,504
Held to Maturity, More than 12 Months, Estimated Fair Value | 0
Held to Maturity, More than 12 Months, Unrealized Losses | 0
Held to Maturity, Total Estimated Fair Value | 2,350,297
Held to Maturity, Total Unrealized Losses | 133,504
Available for Sale, Less than 12 Months, Estimated Fair Value | 358,398
Available for Sale, Less than 12 Months, Unrealized Losses | 6,130
Available for Sale, More than 12 Months, Estimated Fair Value | 46
Available for Sale, More than 12 Months, Unrealized Losses | 1
Available for Sale, Total Estimated Fair Value | 358,444
Available for Sale, Total Unrealized Losses | 6,131
Residential mortgage- backed securities [Member] |
Schedule of Available-for-Sale Securities [Line Items] |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 7,063
Held to Maturity, Less than 12 Months, Unrealized Losses | 57
Held to Maturity, More than 12 Months, Estimated Fair Value | 0
Held to Maturity, More than 12 Months, Unrealized Losses | 0
Held to Maturity, Total Estimated Fair Value | 7,063
Held to Maturity, Total Unrealized Losses | 57
Available for Sale, Less than 12 Months, Estimated Fair Value | 18,244
Available for Sale, Less than 12 Months, Unrealized Losses | 1,025
Available for Sale, More than 12 Months, Estimated Fair Value | 46
Available for Sale, More than 12 Months, Unrealized Losses | 1
Available for Sale, Total Estimated Fair Value | 18,290
Available for Sale, Total Unrealized Losses | 1,026
States and political subdivisions [Member] |
Schedule of Available-for-Sale Securities [Line Items] |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 2,342,235
Held to Maturity, Less than 12 Months, Unrealized Losses | 133,446
Held to Maturity, More than 12 Months, Estimated Fair Value | 0
Held to Maturity, More than 12 Months, Unrealized Losses | 0
Held to Maturity, Total Estimated Fair Value | 2,342,235
Held to Maturity, Total Unrealized Losses | 133,446
Available for Sale, Less than 12 Months, Estimated Fair Value | 340,154
Available for Sale, Less than 12 Months, Unrealized Losses | 5,105
Available for Sale, More than 12 Months, Estimated Fair Value | 0
Available for Sale, More than 12 Months, Unrealized Losses | 0
Available for Sale, Total Estimated Fair Value | 340,154
Available for Sale, Total Unrealized Losses | 5,105
Other [Member] |
Schedule of Available-for-Sale Securities [Line Items] |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 999
Held to Maturity, Less than 12 Months, Unrealized Losses | 1
Held to Maturity, More than 12 Months, Estimated Fair Value | 0
Held to Maturity, More than 12 Months, Unrealized Losses | 0
Held to Maturity, Total Estimated Fair Value | 999
Held to Maturity, Total Unrealized Losses | $ 1

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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