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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | $ 753,839 | $ 1,275,903
Gross Unrealized Holding Losses, Less Than 12 Months | 15,308 | 49,058
Fair Value, 12 Months or Longer | 357,003 | 89,647
Gross Unrealized Holding Losses, 12 Months or Longer | 21,418 | 5,564
Fair Value | 1,110,842 | 1,365,550
Gross Unrealized Holding Losses | 36,726 | 54,622
Government agency [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | 143,534 | 267,936
Gross Unrealized Holding Losses, Less Than 12 Months | 6,842 | 20,514
Fair Value, 12 Months or Longer | 164,282 | 38,563
Gross Unrealized Holding Losses, 12 Months or Longer | 11,744 | 3,361
Fair Value | 307,816 | 306,499
Gross Unrealized Holding Losses | 18,586 | 23,875
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | 542,041 | 851,621
Gross Unrealized Holding Losses, Less Than 12 Months | 7,062 | 23,313
Fair Value, 12 Months or Longer | 148,952 | 22,999
Gross Unrealized Holding Losses, 12 Months or Longer | 8,353 | 1,475
Fair Value | 690,993 | 874,620
Gross Unrealized Holding Losses | 15,415 | 24,788
CMO's / REMIC's - residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | 52,196 | 104,322
Gross Unrealized Holding Losses, Less Than 12 Months | 539 | 1,780
Fair Value, 12 Months or Longer | 15,693 | 17,747
Gross Unrealized Holding Losses, 12 Months or Longer | 24 | 194
Fair Value | 67,889 | 122,069
Gross Unrealized Holding Losses | 563 | 1,974
Municipal bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | 16,068 | 47,116
Gross Unrealized Holding Losses, Less Than 12 Months | 865 | 3,359
Fair Value, 12 Months or Longer | 28,076 | 10,338
Gross Unrealized Holding Losses, 12 Months or Longer | 1,297 | 534
Fair Value | 44,144 | 57,454
Gross Unrealized Holding Losses | 2,162 | 3,893
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 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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