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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Held for Investment, Contractual maturity of debt securities, Amortized Cost |  |
Amortized cost, Within one year | $ 300 | $ 495
Amortized cost, After one year but within five years | 1,146 | 369
Amortized cost, After five years but within ten years | 549 | 562
Amortized cost, After ten years | 2 | 2
Amortized Cost | 1,997 | 1,428
Available for sale, Contractual maturity of debt securities, Amortized Cost |  |
Amortized Cost, Within one year | 103,395 | 411,256
Amortized Cost, After one year but within five years | 270,900 | 313,416
Amortized Cost, After five years but within ten years | 6,355 | 7,524
Amortized Cost, After ten years | 37,603 | 41,378
Amortized Cost | 418,253 | 773,574
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 301 | 495
Estimated Fair Value, After one year but within five years | 1,147 | 370
Estimated Fair Value, After five years but within ten years | 553 | 565
Estimated Fair Value, After ten years | 2 | 3
Estimated Fair Value | 2,003 | 1,433
Available for sale, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 103,084 | 410,327
Estimated Fair Value, After one year but within five years | 276,333 | 311,924
Estimated Fair Value, After five years but within ten years | 6,606 | 7,685
Estimated Fair Value, After ten years | 37,134 | 40,768
Total debt securities | $ 423,157 | $ 770,704

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