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Investment Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 Security | Dec. 31, 2013 Security
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 4,546 | $ 10,607
Available-for-Sale Within One Year, Estimated Fair Value | 763,346 | 366,638
Available-for-Sale Within One Year, Number of Securities | 144 | 124
Available-for-Sale More than One Year, Gross Unrealized Loss | 6,689 | 8,362
Available-for-Sale More than One Year, Estimated Fair Value | 181,462 | 107,384
Available-for-Sale More than One Year, Number of Securities | 73 | 45
Available-for-Sale, Gross Unrealized Loss | 11,235 | 18,969
Available-for-Sale, Estimated Fair Value | 944,808 | 474,022
Available-for-Sale, Number of Securities | 217 | 169
Municipal bonds-taxable [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 9 | 787
Available-for-Sale Within One Year, Estimated Fair Value | 2,238 | 22,817
Available-for-Sale Within One Year, Number of Securities | 2 | 16
Available-for-Sale More than One Year, Gross Unrealized Loss | 138 | 293
Available-for-Sale More than One Year, Estimated Fair Value | 5,511 | 3,813
Available-for-Sale More than One Year, Number of Securities | 5 | 4
Available-for-Sale, Gross Unrealized Loss | 147 | 1,080
Available-for-Sale, Estimated Fair Value | 7,749 | 26,630
Available-for-Sale, Number of Securities | 7 | 20
U.S. treasury securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 1 | 1
Available-for-Sale Within One Year, Estimated Fair Value | 163 | 19,996
Available-for-Sale Within One Year, Number of Securities | 1 | 2
Available-for-Sale More than One Year, Number of Securities |  |
Available-for-Sale, Gross Unrealized Loss | 1 | 1
Available-for-Sale, Estimated Fair Value | 163 | 19,996
Available-for-Sale, Number of Securities | 1 | 2
Municipal bonds-tax exempt [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | 30
Available-for-Sale Within One Year, Estimated Fair Value |  | 8,562
Available-for-Sale Within One Year, Number of Securities |  | 5
Available-for-Sale More than One Year, Number of Securities |  |
Available-for-Sale, Gross Unrealized Loss |  | 30
Available-for-Sale, Estimated Fair Value |  | 8,562
Available-for-Sale, Number of Securities |  | 5
Collateralized mortgage obligations [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 914 | 2,353
Available-for-Sale Within One Year, Estimated Fair Value | 145,816 | 87,026
Available-for-Sale Within One Year, Number of Securities | 30 | 27
Available-for-Sale More than One Year, Gross Unrealized Loss | 805 | 864
Available-for-Sale More than One Year, Estimated Fair Value | 21,188 | 14,657
Available-for-Sale More than One Year, Number of Securities | 9 | 7
Available-for-Sale, Gross Unrealized Loss | 1,719 | 3,217
Available-for-Sale, Estimated Fair Value | 167,004 | 101,683
Available-for-Sale, Number of Securities | 39 | 34
Mortgage-backed securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 2,947 | 3,437
Available-for-Sale Within One Year, Estimated Fair Value | 422,318 | 170,324
Available-for-Sale Within One Year, Number of Securities | 73 | 51
Available-for-Sale More than One Year, Gross Unrealized Loss | 1,764 | 2,589
Available-for-Sale More than One Year, Estimated Fair Value | 60,057 | 30,947
Available-for-Sale More than One Year, Number of Securities | 22 | 12
Available-for-Sale, Gross Unrealized Loss | 4,711 | 6,026
Available-for-Sale, Estimated Fair Value | 482,375 | 201,271
Available-for-Sale, Number of Securities | 95 | 63
U.S. government agency securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 537 | 3,942
Available-for-Sale Within One Year, Estimated Fair Value | 85,948 | 50,932
Available-for-Sale Within One Year, Number of Securities | 22 | 19
Available-for-Sale More than One Year, Gross Unrealized Loss | 3,119 | 3,374
Available-for-Sale More than One Year, Estimated Fair Value | 71,843 | 32,606
Available-for-Sale More than One Year, Number of Securities | 26 | 12
Available-for-Sale, Gross Unrealized Loss | 3,656 | 7,316
Available-for-Sale, Estimated Fair Value | 157,791 | 83,538
Available-for-Sale, Number of Securities | 48 | 31
SBA loan pool securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 27 |
Available-for-Sale Within One Year, Estimated Fair Value | 87,088 |
Available-for-Sale Within One Year, Number of Securities | 15 |
Available-for-Sale More than One Year, Gross Unrealized Loss | 673 | 969
Available-for-Sale More than One Year, Estimated Fair Value | 12,037 | 12,629
Available-for-Sale More than One Year, Number of Securities | 4 | 4
Available-for-Sale, Gross Unrealized Loss | 700 | 969
Available-for-Sale, Estimated Fair Value | 99,125 | 12,629
Available-for-Sale, Number of Securities | 19 | 4
Corporate bonds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | 9
Available-for-Sale Within One Year, Estimated Fair Value |  | 5,024
Available-for-Sale Within One Year, Number of Securities |  | 1
Available-for-Sale More than One Year, Gross Unrealized Loss | 89 | 177
Available-for-Sale More than One Year, Estimated Fair Value | 7,902 | 11,803
Available-for-Sale More than One Year, Number of Securities | 2 | 3
Available-for-Sale, Gross Unrealized Loss | 89 | 186
Available-for-Sale, Estimated Fair Value | 7,902 | 16,827
Available-for-Sale, Number of Securities | 2 | 4
Other securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | 111 | 48
Available-for-Sale Within One Year, Estimated Fair Value | 19,775 | 1,957
Available-for-Sale Within One Year, Number of Securities | 1 | 3
Available-for-Sale More than One Year, Gross Unrealized Loss | 101 | 96
Available-for-Sale More than One Year, Estimated Fair Value | 2,924 | 929
Available-for-Sale More than One Year, Number of Securities | 5 | 3
Available-for-Sale, Gross Unrealized Loss | 212 | 144
Available-for-Sale, Estimated Fair Value | $ 22,699 | $ 2,886
Available-for-Sale, Number of Securities | 6 | 6

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