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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Within one year, Amortized Cost
One to five years, Amortized Cost	6,024
Five to ten years, Amortized Cost	7,848
After ten years, Amortized Cost	2,040
Amortized Cost	15,912
Amortized Cost	144,896	$ 144,905
Within one year, Fair Value
One to five years, Fair Value	6,248
Five to ten years, Fair Value	8,172
After ten years, Fair Value	2,000
Fair Value	16,420
Fair Value	146,807	146,291
Mortgage-backed Securities - GSE Residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	128,984	124,615
Fair Value	$ 130,387	$ 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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