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Securities - Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Amortized Cost
Less than one year, Amortized Cost	$ 57,483
Due after one year through five years, Amortized Cost	202,279
Due after five years through ten years, Amortized Cost	92,349
Due after ten years, Amortized Cost	14,838
Total Amortized Cost	366,949
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Less than one year, Estimated Fair Value	57,339
Due after one year through five years, Estimated Fair Value	202,039
Due after five years through ten years, Estimated Fair Value	89,312
Due after ten years, Estimated Fair Value	15,133
Total Estimated Fair Value	$ 363,823

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