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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, 2017 USD ($) Security | Dec. 31, 2016 USD ($) Security
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 2,442 | $ 4,496
Available-for-Sale Within One Year, Estimated Fair Value | $ 291,460 | $ 320,260
Available-for-Sale Within One Year, Number of Securities | Security | 106 | 128
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 693 | $ 757
Available-for-Sale More than One Year, Estimated Fair Value | $ 30,102 | $ 26,991
Available-for-Sale More than One Year, Number of Securities | Security | 19 | 15
Available-for-Sale, Gross Unrealized Loss | $ 3,135 | $ 5,253
Available-for-Sale, Estimated Fair Value | $ 321,562 | $ 347,251
Available-for-Sale, Number of Securities | Security | 125 | 143
Municipal bonds-tax exempt [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 118 | $ 1,995
Available-for-Sale Within One Year, Estimated Fair Value | $ 5,128 | $ 125,004
Available-for-Sale Within One Year, Number of Securities | Security | 7 | 54
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 | $ 118 | $ 1,995
Available-for-Sale, Estimated Fair Value | $ 5,128 | $ 125,004
Available-for-Sale, Number of Securities | Security | 7 | 54
Municipal bonds-taxable [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 0 | $ 9
Available-for-Sale Within One Year, Estimated Fair Value | $ 154 | $ 2,904
Available-for-Sale Within One Year, Number of Securities | Security | 1 | 2
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 | $ 9
Available-for-Sale, Estimated Fair Value | $ 154 | $ 2,904
Available-for-Sale, Number of Securities | Security | 1 | 2
Mutual funds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 290 | $ 413
Available-for-Sale Within One Year, Estimated Fair Value | $ 21,596 | $ 21,478
Available-for-Sale Within One Year, Number of Securities | Security | 3 | 4
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 111 | $ 109
Available-for-Sale More than One Year, Estimated Fair Value | $ 914 | $ 916
Available-for-Sale More than One Year, Number of Securities | Security | 3 | 3
Available-for-Sale, Gross Unrealized Loss | $ 401 | $ 522
Available-for-Sale, Estimated Fair Value | $ 22,510 | $ 22,394
Available-for-Sale, Number of Securities | Security | 6 | 7
Mortgage-backed securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 1,432 | $ 1,345
Available-for-Sale Within One Year, Estimated Fair Value | $ 189,400 | $ 102,647
Available-for-Sale Within One Year, Number of Securities | Security | 62 | 38
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 64 | $ 112
Available-for-Sale More than One Year, Estimated Fair Value | $ 6,868 | $ 11,350
Available-for-Sale More than One Year, Number of Securities | Security | 2 | 3
Available-for-Sale, Gross Unrealized Loss | $ 1,496 | $ 1,457
Available-for-Sale, Estimated Fair Value | $ 196,268 | $ 113,997
Available-for-Sale, Number of Securities | Security | 64 | 41
Collateralized mortgage obligations [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 560 | $ 676
Available-for-Sale Within One Year, Estimated Fair Value | $ 67,725 | $ 60,786
Available-for-Sale Within One Year, Number of Securities | Security | 30 | 27
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 376 | $ 326
Available-for-Sale More than One Year, Estimated Fair Value | $ 18,424 | $ 10,579
Available-for-Sale More than One Year, Number of Securities | Security | 12 | 7
Available-for-Sale, Gross Unrealized Loss | $ 936 | $ 1,002
Available-for-Sale, Estimated Fair Value | $ 86,149 | $ 71,365
Available-for-Sale, Number of Securities | Security | 42 | 34
U.S. government agency securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 42 | $ 58
Available-for-Sale Within One Year, Estimated Fair Value | $ 7,457 | $ 7,441
Available-for-Sale Within One Year, Number of Securities | Security | 3 | 3
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 | $ 42 | $ 58
Available-for-Sale, Estimated Fair Value | $ 7,457 | $ 7,441
Available-for-Sale, Number of Securities | Security | 3 | 3
SBA loan pool securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 0 | $ 0
Available-for-Sale Within One Year, Estimated Fair Value | $ 0 | $ 0
Available-for-Sale Within One Year, Number of Securities | Security | 0 | 0
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 142 | $ 210
Available-for-Sale More than One Year, Estimated Fair Value | $ 3,896 | $ 4,146
Available-for-Sale More than One Year, Number of Securities | Security | 2 | 2
Available-for-Sale, Gross Unrealized Loss | $ 142 | $ 210
Available-for-Sale, Estimated Fair Value | $ 3,896 | $ 4,146
Available-for-Sale, Number of Securities | Security | 2 | 2

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