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Securities - Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail) $ in Thousands | Sep. 30, 2018 USD ($)
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Investments, Debt and Equity Securities [Abstract] |
Less than one year, Amortized Cost | $ 56,753
Due after one year through five years, Amortized Cost | 156,879
Due after five years through ten years, Amortized Cost | 90,804
Due after ten years, Amortized Cost | 10,795
Total Amortized Cost | 315,231
Less than one year, Estimated Fair Value | 56,522
Due after one year through five years, Estimated Fair Value | 153,904
Due after five years through ten years, Estimated Fair Value | 86,373
Due after ten years, Estimated Fair Value | 11,664
Total Estimated Fair Value | $ 308,463

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