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Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail) $ in Thousands | Mar. 31, 2019 USD ($) Security | Dec. 31, 2018 USD ($) Security
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 40 | $ 321
Available-for-Sale Within One Year, Estimated Fair Value | $ 51,089 | $ 78,252
Available-for-Sale Within One Year, Number of Securities | Security | 10 | 20
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 4,527 | $ 8,616
Available-for-Sale More than One Year, Estimated Fair Value | $ 319,053 | $ 410,128
Available-for-Sale More than One Year, Number of Securities | Security | 157 | 188
Available-for-Sale, Gross Unrealized Loss | $ 4,567 | $ 8,937
Available-for-Sale, Estimated Fair Value | $ 370,142 | $ 488,380
Available-for-Sale, Number of Securities | Security | 167 | 208
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 4 | $ 7
Available-for-Sale Within One Year, Estimated Fair Value | $ 19,773 | $ 14,797
Available-for-Sale Within One Year, Number of Securities | Security | 3 | 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 | $ 4 | $ 7
Available-for-Sale, Estimated Fair Value | $ 19,773 | $ 14,797
Available-for-Sale, Number of Securities | Security | 3 | 2
Mortgage-backed securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 19 | $ 226
Available-for-Sale Within One Year, Estimated Fair Value | $ 13,442 | $ 41,527
Available-for-Sale Within One Year, Number of Securities | Security | 2 | 10
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 2,919 | $ 5,758
Available-for-Sale More than One Year, Estimated Fair Value | $ 214,791 | $ 244,550
Available-for-Sale More than One Year, Number of Securities | Security | 101 | 106
Available-for-Sale, Gross Unrealized Loss | $ 2,938 | $ 5,984
Available-for-Sale, Estimated Fair Value | $ 228,233 | $ 286,077
Available-for-Sale, Number of Securities | Security | 103 | 116
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 17 | $ 59
Available-for-Sale Within One Year, Estimated Fair Value | $ 17,874 | $ 13,732
Available-for-Sale Within One Year, Number of Securities | Security | 5 | 3
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 1,540 | $ 2,273
Available-for-Sale More than One Year, Estimated Fair Value | $ 92,822 | $ 92,532
Available-for-Sale More than One Year, Number of Securities | Security | 50 | 49
Available-for-Sale, Gross Unrealized Loss | $ 1,557 | $ 2,332
Available-for-Sale, Estimated Fair Value | $ 110,696 | $ 106,264
Available-for-Sale, Number of Securities | Security | 55 | 52
Debt securities |  |
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 | $ 53 | $ 97
Available-for-Sale More than One Year, Estimated Fair Value | $ 7,447 | $ 7,402
Available-for-Sale More than One Year, Number of Securities | Security | 3 | 3
Available-for-Sale, Gross Unrealized Loss | $ 53 | $ 97
Available-for-Sale, Estimated Fair Value | $ 7,447 | $ 7,402
Available-for-Sale, Number of Securities | Security | 3 | 3
Total U.S. government agency and sponsored agency obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 36 | $ 285
Available-for-Sale Within One Year, Estimated Fair Value | $ 31,316 | $ 55,259
Available-for-Sale Within One Year, Number of Securities | Security | 7 | 13
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 4,512 | $ 8,128
Available-for-Sale More than One Year, Estimated Fair Value | $ 315,060 | $ 344,484
Available-for-Sale More than One Year, Number of Securities | Security | 154 | 158
Available-for-Sale, Gross Unrealized Loss | $ 4,548 | $ 8,413
Available-for-Sale, Estimated Fair Value | $ 346,376 | $ 399,743
Available-for-Sale, Number of Securities | Security | 161 | 171
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 0 | $ 29
Available-for-Sale Within One Year, Estimated Fair Value | $ 0 | $ 8,196
Available-for-Sale Within One Year, Number of Securities | Security | 0 | 5
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 15 | $ 488
Available-for-Sale More than One Year, Estimated Fair Value | $ 3,993 | $ 65,644
Available-for-Sale More than One Year, Number of Securities | Security | 3 | 30
Available-for-Sale, Gross Unrealized Loss | $ 15 | $ 517
Available-for-Sale, Estimated Fair Value | $ 3,993 | $ 73,840
Available-for-Sale, Number of Securities | Security | 3 | 35

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