Investment Securities - Schedule of Amortized Cost, Gross Unrealized/Unrecognized Gains and Losses and Fair Value of Available for Sale and Held to Maturity Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	$ 57,213	$ 36,884
Available for sale, Gross Unrealized/Unrecognized Gains	557	557
Available for sale, Gross Unrealized/Unrecognized Losses	(383)	(15)
Available for sale, Fair Value	57,387	37,426
Held to maturity, Amortized Cost	337,584	275,772
Held to maturity, Gross Unrealized/Unrecognized Gains	5,980	7,288
Held to maturity, Gross Unrealized/Unrecognized Losses	(1,427)	(1,563)
Held to maturity, Fair Value	342,137	281,497
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	21,931	11,002
Available for sale, Gross Unrealized/Unrecognized Gains	6	47
Available for sale, Gross Unrealized/Unrecognized Losses	(121)
Available for sale, Fair Value	21,816	11,049
Held to maturity, Amortized Cost	33,994	42,001
Held to maturity, Gross Unrealized/Unrecognized Gains	202	454
Held to maturity, Gross Unrealized/Unrecognized Losses	(84)	(5)
Held to maturity, Fair Value	34,112	42,450
Corporate [Member]
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	8,013	5,038
Available for sale, Gross Unrealized/Unrecognized Gains	176	82
Available for sale, Fair Value	8,189	5,120
Held to maturity, Amortized Cost	43,605	43,634
Held to maturity, Gross Unrealized/Unrecognized Gains	1,312	142
Held to maturity, Gross Unrealized/Unrecognized Losses	(38)	(1,459)
Held to maturity, Fair Value	44,879	42,317
State and Municipal [Member]
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	7,041
Available for sale, Gross Unrealized/Unrecognized Gains	104
Available for sale, Gross Unrealized/Unrecognized Losses	(30)
Available for sale, Fair Value	7,115
Held to maturity, Amortized Cost	57,625	9,156
Held to maturity, Gross Unrealized/Unrecognized Gains	440	190
Held to maturity, Gross Unrealized/Unrecognized Losses	(248)	(51)
Held to maturity, Fair Value	57,817	9,295
Mortgage-backed Securities - Residential [Member]
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	17,738	20,844
Available for sale, Gross Unrealized/Unrecognized Gains	148	428
Available for sale, Gross Unrealized/Unrecognized Losses	(232)	(15)
Available for sale, Fair Value	17,654	21,257
Held to maturity, Amortized Cost	96,181	117,160
Held to maturity, Gross Unrealized/Unrecognized Gains	2,713	4,291
Held to maturity, Gross Unrealized/Unrecognized Losses	(107)	(17)
Held to maturity, Fair Value	98,787	121,434
Mortgage-backed Securities - Commercial [Member]
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	2,490
Available for sale, Gross Unrealized/Unrecognized Gains	123
Available for sale, Fair Value	2,613
Held to maturity, Amortized Cost	72,879	18,774
Held to maturity, Gross Unrealized/Unrecognized Gains	937	724
Held to maturity, Gross Unrealized/Unrecognized Losses	(622)
Held to maturity, Fair Value	73,194	19,498
Mortgage-backed Securities - Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Held to maturity, Amortized Cost	33,300	45,047
Held to maturity, Gross Unrealized/Unrecognized Gains	376	1,487
Held to maturity, Gross Unrealized/Unrecognized Losses	(328)	(31)
Held to maturity, Fair Value	$ 33,348	$ 46,503