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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Amortized cost, due in one year, available for sale | $ 0 |
Amortized cost, due after one year through five years, available for sale | 138,993 |
Amortized cost, due after five years through ten years, available for sale | 142,939 |
Amortized cost, due after ten years, available for sale | 847,602 |
Amortized Cost | 1,129,534 | $ 946,751
Estimated Fair Value |  |
Estimated fair value, due in one year, available for sale | 0 |
Estimated fair value, due after one year through five years, available for sale | 139,469 |
Estimated fair value, due after five years through ten years, available for sale | 143,492 |
Estimated fair value, due after ten years, available for sale | 859,996 |
Estimated Fair Value | 1,142,957 | 950,138
Amortized Cost |  |
Amortized cost, due within one year, held to maturity | 0 |
Amortized cost, due after one year through five years, held to maturity | 0 |
Amortized cost, due after five years through ten years, held to maturity | 20,439 |
Amortized cost, due after ten years, held to maturity | 290,257 |
Amortized cost, held to maturity | 310,696 | 375,606
Estimated Fair Value |  |
Estimated fair value, due within one year, held to maturity | 0 |
Estimated fair value, due after one year through five years, held to maturity | 0 |
Estimated fair value, due after five years through ten years, held to maturity | 21,485 |
Estimated fair value, due after ten years, held to maturity | 303,973 |
Estimated fair value, held to maturity | $ 325,458 | $ 381,525

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