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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Held for Investment, Contractual maturity of debt securities, Amortized Cost |  |
Amortized cost, Within one year | $ 1,187 | $ 577
Amortized cost, After one year but within five years | 1,197 | 2,396
Amortized cost, After five years but within ten years | 2 | 4
Amortized Cost | 2,386 | 2,977
Available for sale, Contractual maturity of debt securities, Amortized Cost |  |
Amortized Cost, Within one year | 96,447 | 58,478
Amortized Cost, After one year but within five years | 1,260,280 | 408,253
Amortized Cost, After five years but within ten years | 226,894 | 10,851
Amortized Cost, After ten years | 43,317 | 51,107
Amortized Cost | 1,626,938 | 528,689
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 1,187 | 577
Estimated Fair Value, After one year but within five years | 1,197 | 2,397
Estimated Fair Value, After five years but within ten years | 2 | 4
Estimated Fair Value | 2,386 | 2,978
Available for sale, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 95,552 | 58,688
Estimated Fair Value, After one year but within five years | 1,172,140 | 410,049
Estimated Fair Value, After five years but within ten years | 211,100 | 11,011
Estimated Fair Value, After ten years | 40,467 | 51,775
Total debt securities | $ 1,519,259 | $ 531,523

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