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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Held for Investment, Contractual maturity of debt securities, Amortized Cost |  |
Amortized cost, Within one year | $ 350 | $ 1,186
Amortized cost, After one year but within five years | 841 | 1,195
Amortized cost, After five years but within ten years | 1 | 2
Amortized Cost | 1,192 | 2,383
Available for sale, Contractual maturity of debt securities, Amortized Cost |  |
Amortized Cost, Within one year | 208,397 | 101,607
Amortized Cost, After one year but within five years | 1,317,661 | 1,316,874
Amortized Cost, After five years but within ten years | 60,974 | 170,513
Amortized Cost, After ten years | 38,273 | 42,897
Amortized Cost | 1,625,305 | 1,631,891
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 350 | 1,186
Estimated Fair Value, After one year but within five years | 841 | 1,195
Estimated Fair Value, After five years but within ten years | 1 | 2
Estimated Fair Value | 1,192 | 2,383
Available for sale, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 203,774 | 100,655
Estimated Fair Value, After one year but within five years | 1,228,720 | 1,233,725
Estimated Fair Value, After five years but within ten years | 56,159 | 163,101
Estimated Fair Value, After ten years | 35,603 | 40,740
Total debt securities | $ 1,524,256 | $ 1,538,221

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