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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 9,000 | $ 43,813
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 1 | 55
Fair Value, 12 Months or Longer, Available-for-sale | 0 | 509,509
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 0 | 12,123
Fair Value, Available-for-sale | 9,000 | 553,322
Gross Unrealized Holding Losses, Available-for-sale | 1 | 12,178
Fair Value, Less Than 12 Months, Held-to-maturity | 81,956 |
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | 196 |
Fair Value, 12 Months or Longer, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 0 |
Fair Value, Held-to-maturity | 81,956 |
Gross Unrealized Holding Losses, Held-to-maturity | 196 |
CMO's/REMIC's - Residential [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 0 | 0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 0 | 0
Fair Value, 12 Months or Longer, Available-for-sale | 0 | 31,143
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 0 | 277
Fair Value, Available-for-sale | 0 | 31,143
Gross Unrealized Holding Losses, Available-for-sale | 0 | 277
Fair Value, Less Than 12 Months, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | 0 |
Fair Value, 12 Months or Longer, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 0 |
Fair Value, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, Held-to-maturity | 0 |
Municipal Bonds [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 0 | 1,953
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 0 | 23
Fair Value, 12 Months or Longer, Available-for-sale | 0 | 24,812
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 0 | 622
Fair Value, Available-for-sale | 0 | 26,765
Gross Unrealized Holding Losses, Available-for-sale | 0 | 645
Fair Value, Less Than 12 Months, Held-to-maturity | 81,956 |
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | 196 |
Fair Value, 12 Months or Longer, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 0 |
Fair Value, Held-to-maturity | 81,956 |
Gross Unrealized Holding Losses, Held-to-maturity | 196 |
Government Agency/GSEs [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 9,000 | 22,224
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 1 | 28
Fair Value, 12 Months or Longer, Available-for-sale | 0 | 307,873
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 0 | 8,200
Fair Value, Available-for-sale | 9,000 | 330,097
Gross Unrealized Holding Losses, Available-for-sale | 1 | 8,228
Fair Value, Less Than 12 Months, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | 0 |
Fair Value, 12 Months or Longer, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 0 |
Fair Value, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, Held-to-maturity | 0 |
Residential Mortgage-backed Securities [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 0 | 19,636
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 0 | 4
Fair Value, 12 Months or Longer, Available-for-sale | 0 | 145,681
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 0 | 3,024
Fair Value, Available-for-sale | 0 | 165,317
Gross Unrealized Holding Losses, Available-for-sale | 0 | 3,028
Fair Value, Less Than 12 Months, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | 0 |
Fair Value, 12 Months or Longer, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 0 |
Fair Value, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, Held-to-maturity | 0 |
Other Securities [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 0 | 0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 0 | 0
Fair Value, 12 Months or Longer, Available-for-sale | 0 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | 0 | 0
Gross Unrealized Holding Losses, Available-for-sale | 0 | $ 0
Fair Value, Less Than 12 Months, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | 0 |
Fair Value, 12 Months or Longer, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 0 |
Fair Value, Held-to-maturity | 0 |
Gross Unrealized Holding Losses, Held-to-maturity | $ 0 |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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