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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Held for Investment, Contractual maturity of debt securities, Amortized Cost |  |
Amortized cost, Within one year | $ 862 | $ 807
Amortized cost, After one year but within five years | 2,089 | 2,091
Amortized cost, After five years but within ten years | 4 | 65
Amortized cost, After ten years | 1 | 1
Amortized Cost | 2,956 | 2,964
Available for sale, Contractual maturity of debt securities, Amortized Cost |  |
Amortized Cost, Within one year | 110,317 | 339,752
Amortized Cost, After one year but within five years | 359,388 | 162,401
Amortized Cost, After five years but within ten years | 5,914 | 3,753
Amortized Cost, After ten years | 33,367 | 36,383
Amortized Cost | 508,986 | 542,289
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 862 | 809
Estimated Fair Value, After one year but within five years | 2,085 | 2,110
Estimated Fair Value, After five years but within ten years | 5 | 64
Estimated Fair Value, After ten years | 1 | 1
Estimated Fair Value | 2,953 | 2,984
Available for sale, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 111,484 | 341,102
Estimated Fair Value, After one year but within five years | 366,433 | 171,135
Estimated Fair Value, After five years but within ten years | 6,049 | 3,910
Estimated Fair Value, After ten years | 33,621 | 36,085
Total debt securities | $ 517,587 | $ 552,232

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