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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Within one year, Amortized Cost	$ 0
One to five years, Amortized Cost	6,102
Five to ten years, Amortized Cost	4,458
After ten years, Amortized Cost	2,040
Amortized Cost	12,600
Amortized Cost	148,711	$ 144,905
Within one year, Fair Value	0
One to five years, Fair Value	6,615
Five to ten years, Fair Value	4,682
After ten years, Fair Value	2,011
Fair Value	13,308
Fair Value	152,948	146,291
Mortgage-backed Securities - GSE Residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	136,111	124,615
Fair Value	$ 139,640	$ 125,510

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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