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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Held for Investment, Contractual maturity of debt securities, Amortized Cost |  |
Amortized cost, Within one year | $ 1,186 | $ 1,186
Amortized cost, After one year but within five years | 1,336,179 | 1,316,874
Amortized cost, After five years but within ten years | 2 | 2
Amortized Cost | 2,320 | 2,383
Available for sale, Contractual maturity of debt securities, Amortized Cost |  |
Amortized Cost, Within one year | 105,557 | 101,607
Amortized Cost, After one year but within five years | 1,132 | 1,195
Amortized Cost, After five years but within ten years | 207,450 | 170,513
Amortized Cost, After ten years | 41,244 | 42,897
Amortized Cost | 1,690,430 | 1,631,891
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 1,186 | 1,186
Estimated Fair Value, After one year but within five years | 1,267,384 | 1,233,725
Estimated Fair Value, After five years but within ten years | 2 | 2
Estimated Fair Value | 2,321 | 2,383
Available for sale, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 104,164 | 100,655
Estimated Fair Value, After one year but within five years | 1,133 | 1,195
Estimated Fair Value, After five years but within ten years | 205,173 | 163,101
Estimated Fair Value, After ten years | 39,192 | 40,740
Total debt securities | $ 1,615,913 | $ 1,538,221

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