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Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) Security | Dec. 31, 2015 USD ($) Security
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 170 | $ 2,628
Available-for-Sale Within One Year, Estimated Fair Value | $ 59,163 | $ 359,531
Available-for-Sale Within One Year, Number of Securities | Security | 20 | 104
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 286 | $ 2,191
Available-for-Sale More than One Year, Estimated Fair Value | $ 45,251 | $ 87,120
Available-for-Sale More than One Year, Number of Securities | Security | 19 | 36
Available-for-Sale, Gross Unrealized Loss | $ 456 | $ 4,819
Available-for-Sale, Estimated Fair Value | $ 104,414 | $ 446,651
Available-for-Sale, Number of Securities | Security | 39 | 140
Municipal bonds-tax exempt [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 0 | $ 19
Available-for-Sale Within One Year, Estimated Fair Value | $ 0 | $ 8,922
Available-for-Sale Within One Year, Number of Securities | Security | 0 | 6
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 0 | $ 0
Available-for-Sale More than One Year, Estimated Fair Value | $ 0 | $ 0
Available-for-Sale More than One Year, Number of Securities | Security | 0 | 0
Available-for-Sale, Gross Unrealized Loss | $ 0 | $ 19
Available-for-Sale, Estimated Fair Value | $ 0 | $ 8,922
Available-for-Sale, Number of Securities | Security | 0 | 6
Municipal bonds-taxable [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 0 | $ 88
Available-for-Sale Within One Year, Estimated Fair Value | $ 0 | $ 7,106
Available-for-Sale Within One Year, Number of Securities | Security | 0 | 4
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 0 | $ 0
Available-for-Sale More than One Year, Estimated Fair Value | $ 0 | $ 0
Available-for-Sale More than One Year, Number of Securities | Security | 0 | 0
Available-for-Sale, Gross Unrealized Loss | $ 0 | $ 88
Available-for-Sale, Estimated Fair Value | $ 0 | $ 7,106
Available-for-Sale, Number of Securities | Security | 0 | 4
Mutual funds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 0 | $ 66
Available-for-Sale Within One Year, Estimated Fair Value | $ 0 | $ 21,820
Available-for-Sale Within One Year, Number of Securities | Security | 0 | 3
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 85 | $ 97
Available-for-Sale More than One Year, Estimated Fair Value | $ 941 | $ 928
Available-for-Sale More than One Year, Number of Securities | Security | 3 | 3
Available-for-Sale, Gross Unrealized Loss | $ 85 | $ 163
Available-for-Sale, Estimated Fair Value | $ 941 | $ 22,748
Available-for-Sale, Number of Securities | Security | 3 | 6
Collateralized mortgage obligations [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 10 | $ 335
Available-for-Sale Within One Year, Estimated Fair Value | $ 12,778 | $ 48,970
Available-for-Sale Within One Year, Number of Securities | Security | 6 | 18
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 81 | $ 662
Available-for-Sale More than One Year, Estimated Fair Value | $ 13,879 | $ 32,964
Available-for-Sale More than One Year, Number of Securities | Security | 7 | 13
Available-for-Sale, Gross Unrealized Loss | $ 91 | $ 997
Available-for-Sale, Estimated Fair Value | $ 26,657 | $ 81,934
Available-for-Sale, Number of Securities | Security | 13 | 31
Mortgage-backed securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 43 | $ 1,734
Available-for-Sale Within One Year, Estimated Fair Value | $ 10,746 | $ 193,931
Available-for-Sale Within One Year, Number of Securities | Security | 4 | 52
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 34 | $ 727
Available-for-Sale More than One Year, Estimated Fair Value | $ 10,912 | $ 21,659
Available-for-Sale More than One Year, Number of Securities | Security | 3 | 9
Available-for-Sale, Gross Unrealized Loss | $ 77 | $ 2,461
Available-for-Sale, Estimated Fair Value | $ 21,658 | $ 215,590
Available-for-Sale, Number of Securities | Security | 7 | 61
U.S. government agency securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 0 | $ 201
Available-for-Sale Within One Year, Estimated Fair Value | $ 0 | $ 23,289
Available-for-Sale Within One Year, Number of Securities | Security | 0 | 8
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 0 | $ 455
Available-for-Sale More than One Year, Estimated Fair Value | $ 0 | $ 24,533
Available-for-Sale More than One Year, Number of Securities | Security | 0 | 8
Available-for-Sale, Gross Unrealized Loss | $ 0 | $ 656
Available-for-Sale, Estimated Fair Value | $ 0 | $ 47,822
Available-for-Sale, Number of Securities | Security | 0 | 16
SBA loan pool securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 117 | $ 161
Available-for-Sale Within One Year, Estimated Fair Value | $ 35,639 | $ 50,499
Available-for-Sale Within One Year, Number of Securities | Security | 10 | 12
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 73 | $ 250
Available-for-Sale More than One Year, Estimated Fair Value | $ 14,518 | $ 7,036
Available-for-Sale More than One Year, Number of Securities | Security | 5 | 3
Available-for-Sale, Gross Unrealized Loss | $ 190 | $ 411
Available-for-Sale, Estimated Fair Value | $ 50,157 | $ 57,535
Available-for-Sale, Number of Securities | Security | 15 | 15
Corporate bonds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 0 | $ 24
Available-for-Sale Within One Year, Estimated Fair Value | $ 0 | $ 4,994
Available-for-Sale Within One Year, Number of Securities | Security | 0 | 1
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 13 | $ 0
Available-for-Sale More than One Year, Estimated Fair Value | $ 5,001 | $ 0
Available-for-Sale More than One Year, Number of Securities | Security | 1 | 0
Available-for-Sale, Gross Unrealized Loss | $ 13 | $ 24
Available-for-Sale, Estimated Fair Value | $ 5,001 | $ 4,994
Available-for-Sale, Number of Securities | Security | 1 | 1

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