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Securities Held to Maturity - Stratification by Contractual Maturity of Securities (Detail) - Debt Securities [Member] - USD ($) $ in Thousands | Mar. 31, 2019 | Jun. 30, 2018
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Schedule Of Held To Maturity Securities [Line Items] |  |
Due in one year or less, Amortized Cost | $ 9,692 |
Due after one year through five years, Amortized Cost | 31,293 |
Due after five years through ten years, Amortized Cost | 126,502 |
Due after ten years, Amortized Cost | 2,995 |
Amortized Cost | 170,482 | $ 155,777
Due in one year or less, Fair Value | 9,675 |
Due after one year through five years, Fair Value | 31,286 |
Due after five years through ten years, Fair Value | 127,160 |
Due after ten years, Fair Value | 3,048 |
Held-to-maturity Securities, Fair Value Total | $ 171,169 | $ 153,744

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