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Securities - Securities, with Unrealized Losses Segregated by Length of Impairment (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Schedule of Available-for-Sale Securities [Line Items] |
Held to Maturity, Less than 12 Months, Estimated Fair Value | $ 200,820
Held to Maturity, Less than 12 Months, Unrealized Losses | 828
Held to Maturity, More than 12 Months, Estimated Fair Value | 1,410,468
Held to Maturity, More than 12 Months, Unrealized Losses | 31,457
Held to Maturity, Total Estimated Fair Value | 1,611,288
Held to Maturity, Total Unrealized Losses | 32,285
Available for Sale, Less than 12 Months, Estimated Fair Value | 219,522
Available for Sale, Less than 12 Months, Unrealized Losses | 245
Available for Sale, More than 12 Months, Estimated Fair Value | 22,887
Available for Sale, More than 12 Months, Unrealized Losses | 689
Available for Sale, Total Estimated Fair Value | 242,409
Available for Sale, Total Unrealized Losses | 934
Residential mortgage- backed securities [Member] |
Schedule of Available-for-Sale Securities [Line Items] |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 0
Held to Maturity, Less than 12 Months, Unrealized Losses | 0
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 | 0
Held to Maturity, Total Unrealized Losses | 0
Available for Sale, Less than 12 Months, Estimated Fair Value | 5,384
Available for Sale, Less than 12 Months, Unrealized Losses | 12
Available for Sale, More than 12 Months, Estimated Fair Value | 17,509
Available for Sale, More than 12 Months, Unrealized Losses | 651
Available for Sale, Total Estimated Fair Value | 22,893
Available for Sale, Total Unrealized Losses | 663
States and political subdivisions [Member] |
Schedule of Available-for-Sale Securities [Line Items] |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 200,820
Held to Maturity, Less than 12 Months, Unrealized Losses | 828
Held to Maturity, More than 12 Months, Estimated Fair Value | 1,410,468
Held to Maturity, More than 12 Months, Unrealized Losses | 31,457
Held to Maturity, Total Estimated Fair Value | 1,611,288
Held to Maturity, Total Unrealized Losses | 32,285
Available for Sale, Less than 12 Months, Estimated Fair Value | 63,962
Available for Sale, Less than 12 Months, Unrealized Losses | 213
Available for Sale, More than 12 Months, Estimated Fair Value | 5,378
Available for Sale, More than 12 Months, Unrealized Losses | 38
Available for Sale, Total Estimated Fair Value | 69,340
Available for Sale, Total Unrealized Losses | 251
U.S. Treasury [Member] |
Schedule of Available-for-Sale Securities [Line Items] |
Available for Sale, Less than 12 Months, Estimated Fair Value | 150,176
Available for Sale, Less than 12 Months, Unrealized Losses | 20
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 | 150,176
Available for Sale, Total Unrealized Losses | $ 20

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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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