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Securities - Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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Investments, Debt and Equity Securities [Abstract] |
Less than one year, Amortized Cost | $ 50,564
Due after one year through five years, Amortized Cost | 159,365
Due after five years through ten years, Amortized Cost | 85,574
Due after ten years, Amortized Cost | 10,817
Total Amortized Cost | 306,320
Less than one year, Estimated Fair Value | 50,346
Due after one year through five years, Estimated Fair Value | 157,606
Due after five years through ten years, Estimated Fair Value | 80,049
Due after ten years, Estimated Fair Value | 10,901
Total Estimated Fair Value | $ 298,902

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