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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Held for Investment, Contractual maturity of debt securities, Amortized Cost |  |
Amortized cost, Within one year | $ 495 | $ 1,036
Amortized cost, After one year but within five years | 369 | 623
Amortized cost, After five years but within ten years | 562 | 625
Amortized cost, After ten years | 2 | 8
Amortized Cost | 1,428 | 2,292
Available for sale, Contractual maturity of debt securities, Amortized Cost |  |
Amortized Cost, Within one year | 411,256 | 113,225
Amortized Cost, After one year but within five years | 313,416 | 289,038
Amortized Cost, After five years but within ten years | 7,524 | 6,222
Amortized Cost, After ten years | 41,378 | 55,813
Amortized Cost | 773,574 | 464,298
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 495 | 1,034
Estimated Fair Value, After one year but within five years | 370 | 627
Estimated Fair Value, After five years but within ten years | 565 | 633
Estimated Fair Value, After ten years | 3 | 9
Estimated Fair Value | 1,433 | 2,303
Available for sale, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 410,327 | 112,974
Estimated Fair Value, After one year but within five years | 311,924 | 287,058
Estimated Fair Value, After five years but within ten years | 7,685 | 6,500
Estimated Fair Value, After ten years | 40,768 | 55,467
Total debt securities | $ 770,704 | $ 461,999

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