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Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) Security | Dec. 31, 2015 USD ($) Security
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 467 | $ 2,628
Available-for-Sale Within One Year, Estimated Fair Value | $ 136,122 | $ 359,531
Available-for-Sale Within One Year, Number of Securities | Security | 33 | 104
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 531 | $ 2,191
Available-for-Sale More than One Year, Estimated Fair Value | $ 50,184 | $ 87,120
Available-for-Sale More than One Year, Number of Securities | Security | 25 | 36
Available-for-Sale, Gross Unrealized Loss | $ 998 | $ 4,819
Available-for-Sale, Estimated Fair Value | $ 186,306 | $ 446,651
Available-for-Sale, Number of Securities | Security | 58 | 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 | $ 854 | $ 8,922
Available-for-Sale Within One Year, Number of Securities | Security | 1 | 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 | $ 854 | $ 8,922
Available-for-Sale, Number of Securities | Security | 1 | 6
Municipal bonds-taxable [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | $ 88
Available-for-Sale Within One Year, Estimated Fair Value |  | $ 7,106
Available-for-Sale Within One Year, Number of Securities | Security |  | 4
Available-for-Sale More than One Year, Gross Unrealized Loss |  | $ 0
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 0
Available-for-Sale More than One Year, Number of Securities | Security |  | 0
Available-for-Sale, Gross Unrealized Loss |  | $ 88
Available-for-Sale, Estimated Fair Value |  | $ 7,106
Available-for-Sale, Number of Securities | Security |  | 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 | $ 87 | $ 97
Available-for-Sale More than One Year, Estimated Fair Value | $ 939 | $ 928
Available-for-Sale More than One Year, Number of Securities | Security | 3 | 3
Available-for-Sale, Gross Unrealized Loss | $ 87 | $ 163
Available-for-Sale, Estimated Fair Value | $ 939 | $ 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 | $ 43 | $ 335
Available-for-Sale Within One Year, Estimated Fair Value | $ 18,161 | $ 48,970
Available-for-Sale Within One Year, Number of Securities | Security | 7 | 18
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 179 | $ 662
Available-for-Sale More than One Year, Estimated Fair Value | $ 15,364 | $ 32,964
Available-for-Sale More than One Year, Number of Securities | Security | 8 | 13
Available-for-Sale, Gross Unrealized Loss | $ 222 | $ 997
Available-for-Sale, Estimated Fair Value | $ 33,525 | $ 81,934
Available-for-Sale, Number of Securities | Security | 15 | 31
Mortgage-backed securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 281 | $ 1,734
Available-for-Sale Within One Year, Estimated Fair Value | $ 65,007 | $ 193,931
Available-for-Sale Within One Year, Number of Securities | Security | 12 | 52
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 166 | $ 727
Available-for-Sale More than One Year, Estimated Fair Value | $ 18,704 | $ 21,659
Available-for-Sale More than One Year, Number of Securities | Security | 8 | 9
Available-for-Sale, Gross Unrealized Loss | $ 447 | $ 2,461
Available-for-Sale, Estimated Fair Value | $ 83,711 | $ 215,590
Available-for-Sale, Number of Securities | Security | 20 | 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 | $ 8 | $ 455
Available-for-Sale More than One Year, Estimated Fair Value | $ 7,984 | $ 24,533
Available-for-Sale More than One Year, Number of Securities | Security | 3 | 8
Available-for-Sale, Gross Unrealized Loss | $ 8 | $ 656
Available-for-Sale, Estimated Fair Value | $ 7,984 | $ 47,822
Available-for-Sale, Number of Securities | Security | 3 | 16
SBA loan pool securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 125 | $ 161
Available-for-Sale Within One Year, Estimated Fair Value | $ 47,102 | $ 50,499
Available-for-Sale Within One Year, Number of Securities | Security | 12 | 12
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 91 | $ 250
Available-for-Sale More than One Year, Estimated Fair Value | $ 7,193 | $ 7,036
Available-for-Sale More than One Year, Number of Securities | Security | 3 | 3
Available-for-Sale, Gross Unrealized Loss | $ 216 | $ 411
Available-for-Sale, Estimated Fair Value | $ 54,295 | $ 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 | $ 18 | $ 24
Available-for-Sale Within One Year, Estimated Fair Value | $ 4,998 | $ 4,994
Available-for-Sale Within One Year, Number of Securities | Security | 1 | 1
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 | $ 18 | $ 24
Available-for-Sale, Estimated Fair Value | $ 4,998 | $ 4,994
Available-for-Sale, Number of Securities | Security | 1 | 1

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