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Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail) $ in Thousands | Jun. 30, 2020 USD ($) Security | Dec. 31, 2019 USD ($) Security
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (630) | $ (318)
Available-for-Sale Within One Year, Estimated Fair Value | $ 301,567 | $ 100,916
Available-for-Sale Within One Year, Number of Securities | Security | 44 | 33
Available-for-Sale More than One Year, Gross Unrealized Loss |  | $ (483)
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 61,690
Available-for-Sale More than One Year, Number of Securities | Security |  | 51
Available-for-Sale, Gross Unrealized Loss | $ (630) | $ (801)
Available-for-Sale, Estimated Fair Value | $ 301,567 | $ 162,606
Available-for-Sale, Number of Securities | Security | 44 | 84
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Estimated Fair Value | $ 29,988 |
Available-for-Sale Within One Year, Number of Securities | Security | 4 |
Available-for-Sale, Estimated Fair Value | $ 29,988 |
Available-for-Sale, Number of Securities | Security | 4 |
Mortgage-backed securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (437) | $ (186)
Available-for-Sale Within One Year, Estimated Fair Value | $ 192,403 | $ 51,261
Available-for-Sale Within One Year, Number of Securities | Security | 23 | 17
Available-for-Sale More than One Year, Gross Unrealized Loss |  | $ (161)
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 18,757
Available-for-Sale More than One Year, Number of Securities | Security |  | 14
Available-for-Sale, Gross Unrealized Loss | $ (437) | $ (347)
Available-for-Sale, Estimated Fair Value | $ 192,403 | $ 70,018
Available-for-Sale, Number of Securities | Security | 23 | 31
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (176) | $ (112)
Available-for-Sale Within One Year, Estimated Fair Value | $ 46,693 | $ 41,419
Available-for-Sale Within One Year, Number of Securities | Security | 12 | 14
Available-for-Sale More than One Year, Gross Unrealized Loss |  | $ (320)
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 39,936
Available-for-Sale More than One Year, Number of Securities | Security |  | 36
Available-for-Sale, Gross Unrealized Loss | $ (176) | $ (432)
Available-for-Sale, Estimated Fair Value | $ 46,693 | $ 81,355
Available-for-Sale, Number of Securities | Security | 12 | 50
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (17) | $ (20)
Available-for-Sale Within One Year, Estimated Fair Value | $ 32,483 | $ 8,235
Available-for-Sale Within One Year, Number of Securities | Security | 5 | 2
Available-for-Sale More than One Year, Gross Unrealized Loss |  | $ (3)
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 2,997
Available-for-Sale More than One Year, Number of Securities | Security |  | 1
Available-for-Sale, Gross Unrealized Loss | $ (17) | $ (22)
Available-for-Sale, Estimated Fair Value | $ 32,483 | $ 11,233
Available-for-Sale, Number of Securities | Security | 5 | 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 | $ (630) | $ (318)
Available-for-Sale Within One Year, Estimated Fair Value | $ 271,579 | $ 100,916
Available-for-Sale Within One Year, Number of Securities | Security | 40 | 33
Available-for-Sale More than One Year, Gross Unrealized Loss |  | $ (483)
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 61,690
Available-for-Sale More than One Year, Number of Securities | Security |  | 51
Available-for-Sale, Gross Unrealized Loss | $ (630) | $ (801)
Available-for-Sale, Estimated Fair Value | $ 271,579 | $ 162,606
Available-for-Sale, Number of Securities | Security | 40 | 84

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