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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, 2017 USD ($) Security | Dec. 31, 2016 USD ($) Security
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 3,309 | $ 4,496
Available-for-Sale Within One Year, Estimated Fair Value | $ 345,987 | $ 320,260
Available-for-Sale Within One Year, Number of Securities | Security | 131 | 128
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 749 | $ 757
Available-for-Sale More than One Year, Estimated Fair Value | $ 28,061 | $ 26,991
Available-for-Sale More than One Year, Number of Securities | Security | 16 | 15
Available-for-Sale, Gross Unrealized Loss | $ 4,058 | $ 5,253
Available-for-Sale, Estimated Fair Value | $ 374,048 | $ 347,251
Available-for-Sale, Number of Securities | Security | 147 | 143
Municipal bonds-tax exempt [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 860 | $ 1,995
Available-for-Sale Within One Year, Estimated Fair Value | $ 104,412 | $ 125,004
Available-for-Sale Within One Year, Number of Securities | Security | 45 | 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 | $ 860 | $ 1,995
Available-for-Sale, Estimated Fair Value | $ 104,412 | $ 125,004
Available-for-Sale, Number of Securities | Security | 45 | 54
Municipal bonds-taxable [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 8 | $ 9
Available-for-Sale Within One Year, Estimated Fair Value | $ 1,036 | $ 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 | $ 8 | $ 9
Available-for-Sale, Estimated Fair Value | $ 1,036 | $ 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 | $ 413 | $ 413
Available-for-Sale Within One Year, Estimated Fair Value | $ 21,478 | $ 21,478
Available-for-Sale Within One Year, Number of Securities | Security | 4 | 4
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 113 | $ 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 | $ 526 | $ 522
Available-for-Sale, Estimated Fair Value | $ 22,392 | $ 22,394
Available-for-Sale, Number of Securities | Security | 7 | 7
Mortgage-backed securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 1,418 | $ 1,345
Available-for-Sale Within One Year, Estimated Fair Value | $ 149,993 | $ 102,647
Available-for-Sale Within One Year, Number of Securities | Security | 51 | 38
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 62 | $ 112
Available-for-Sale More than One Year, Estimated Fair Value | $ 7,096 | $ 11,350
Available-for-Sale More than One Year, Number of Securities | Security | 2 | 3
Available-for-Sale, Gross Unrealized Loss | $ 1,480 | $ 1,457
Available-for-Sale, Estimated Fair Value | $ 157,089 | $ 113,997
Available-for-Sale, Number of Securities | Security | 53 | 41
Collateralized mortgage obligations [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 557 | $ 676
Available-for-Sale Within One Year, Estimated Fair Value | $ 61,622 | $ 60,786
Available-for-Sale Within One Year, Number of Securities | Security | 27 | 27
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 383 | $ 326
Available-for-Sale More than One Year, Estimated Fair Value | $ 15,888 | $ 10,579
Available-for-Sale More than One Year, Number of Securities | Security | 9 | 7
Available-for-Sale, Gross Unrealized Loss | $ 940 | $ 1,002
Available-for-Sale, Estimated Fair Value | $ 77,510 | $ 71,365
Available-for-Sale, Number of Securities | Security | 36 | 34
U.S. government agency securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 53 | $ 58
Available-for-Sale Within One Year, Estimated Fair Value | $ 7,446 | $ 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 | $ 53 | $ 58
Available-for-Sale, Estimated Fair Value | $ 7,446 | $ 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 | $ 191 | $ 210
Available-for-Sale More than One Year, Estimated Fair Value | $ 4,163 | $ 4,146
Available-for-Sale More than One Year, Number of Securities | Security | 2 | 2
Available-for-Sale, Gross Unrealized Loss | $ 191 | $ 210
Available-for-Sale, Estimated Fair Value | $ 4,163 | $ 4,146
Available-for-Sale, Number of Securities | Security | 2 | 2

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