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Securities Available for Sale - Stratification by Contractual Maturity of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 28,024
Due after one year through five years, Amortized Cost	119,032
Due after five years through ten years, Amortized Cost	171,822
Due after ten years, Amortized Cost	346,295
Securities available for sale, Amortized Cost	665,173
Due in one year or less, Fair Value	28,113
Due after one year through five years, Fair Value	118,420
Due after five years through ten years, Fair Value	173,997
Due after ten years, Fair Value	345,847
Fair Value	$ 666,377	$ 544,333

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