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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | $ 1,275,903 | $ 194,146
Gross Unrealized Holding Losses, Less Than 12 Months | 49,058 | 1,109
Fair Value, 12 Months or Longer | 89,647 | 70,017
Gross Unrealized Holding Losses, 12 Months or Longer | 5,564 | 859
Fair Value | 1,365,550 | 264,163
Gross Unrealized Holding Losses | 54,622 | 1,968
Government agency [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | 267,936 | 51,134
Gross Unrealized Holding Losses, Less Than 12 Months | 20,514 | 248
Fair Value, 12 Months or Longer | 38,563 |
Gross Unrealized Holding Losses, 12 Months or Longer | 3,361 |
Fair Value | 306,499 | 51,134
Gross Unrealized Holding Losses | 23,875 | 248
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | 851,621 | 55,118
Gross Unrealized Holding Losses, Less Than 12 Months | 23,313 | 127
Fair Value, 12 Months or Longer | 22,999 |
Gross Unrealized Holding Losses, 12 Months or Longer | 1,475 |
Fair Value | 874,620 | 55,118
Gross Unrealized Holding Losses | 24,788 | 127
CMO/REMICs [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | 104,322 | 74,784
Gross Unrealized Holding Losses, Less Than 12 Months | 1,780 | 572
Fair Value, 12 Months or Longer | 17,747 | 69,042
Gross Unrealized Holding Losses, 12 Months or Longer | 194 | 838
Fair Value | 122,069 | 143,826
Gross Unrealized Holding Losses | 1,974 | 1,410
Municipal bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | 47,116 | 13,110
Gross Unrealized Holding Losses, Less Than 12 Months | 3,359 | 162
Fair Value, 12 Months or Longer | 10,338 | 975
Gross Unrealized Holding Losses, 12 Months or Longer | 534 | 21
Fair Value | 57,454 | 14,085
Gross Unrealized Holding Losses | 3,893 | 183
Other securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | 4,908 |
Gross Unrealized Holding Losses, Less Than 12 Months | 92 |
Fair Value, 12 Months or Longer |  |
Gross Unrealized Holding Losses, 12 Months or Longer |  |
Fair Value | 4,908 |
Gross Unrealized Holding Losses | $ 92 |

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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for twelve months or longer impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments on securities classified as available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months impacting investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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