Investment Securities - Schedule of Amortized Cost, Gross Unrealized/Unrecognized Gains and Losses and Fair Value of Available for Sale and Held to Maturity Debt Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2021
Schedule of Investments [Line Items]
Available for sale debt securities, Amortized Cost	$ 40,374	$ 57,213
Available for sale debt securities, Gross Unrealized/Unrecognized Gains	31	557
Available for sale debt securities, Gross Unrealized/Unrecognized Losses	(3,220)	(383)
Available for sale debt securities, Fair Value	37,185	57,387
Held to maturity debt securities, Amortized Cost	410,896	337,584
Held to maturity debt securities, Gross Unrealized/Unrecognized Gains	767	5,980
Held to maturity debt securities, Gross Unrealized/Unrecognized Losses	(32,163)	(1,427)
Held to maturity debt securities, Fair Value	379,500	342,137
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Available for sale debt securities, Amortized Cost	10,939	21,931
Available for sale debt securities, Gross Unrealized/Unrecognized Gains		6
Available for sale debt securities, Gross Unrealized/Unrecognized Losses	(710)	(121)
Available for sale debt securities, Fair Value	10,229	21,816
Held to maturity debt securities, Amortized Cost	49,995	33,994
Held to maturity debt securities, Gross Unrealized/Unrecognized Gains	44	202
Held to maturity debt securities, Gross Unrealized/Unrecognized Losses	(1,989)	(84)
Held to maturity debt securities, Fair Value	48,050	34,112
Corporate [Member]
Schedule of Investments [Line Items]
Available for sale debt securities, Amortized Cost	5,000	8,013
Available for sale debt securities, Gross Unrealized/Unrecognized Gains	8	176
Available for sale debt securities, Gross Unrealized/Unrecognized Losses	(30)
Available for sale debt securities, Fair Value	4,978	8,189
Held to maturity debt securities, Amortized Cost	52,083	43,605
Held to maturity debt securities, Gross Unrealized/Unrecognized Gains	562	1,312
Held to maturity debt securities, Gross Unrealized/Unrecognized Losses	(2,075)	(38)
Held to maturity debt securities, Fair Value	50,570	44,879
State and Municipal [Member]
Schedule of Investments [Line Items]
Available for sale debt securities, Amortized Cost	7,040	7,041
Available for sale debt securities, Gross Unrealized/Unrecognized Gains		104
Available for sale debt securities, Gross Unrealized/Unrecognized Losses	(1,507)	(30)
Available for sale debt securities, Fair Value	5,533	7,115
Held to maturity debt securities, Amortized Cost	87,407	57,625
Held to maturity debt securities, Gross Unrealized/Unrecognized Gains		440
Held to maturity debt securities, Gross Unrealized/Unrecognized Losses	(15,294)	(248)
Held to maturity debt securities, Fair Value	72,113	57,817
Mortgage-backed Securities - Residential [Member]
Schedule of Investments [Line Items]
Available for sale debt securities, Amortized Cost	14,960	17,738
Available for sale debt securities, Gross Unrealized/Unrecognized Gains	23	148
Available for sale debt securities, Gross Unrealized/Unrecognized Losses	(941)	(232)
Available for sale debt securities, Fair Value	14,042	17,654
Held to maturity debt securities, Amortized Cost	106,302	96,181
Held to maturity debt securities, Gross Unrealized/Unrecognized Gains	97	2,713
Held to maturity debt securities, Gross Unrealized/Unrecognized Losses	(5,158)	(107)
Held to maturity debt securities, Fair Value	101,241	98,787
Mortgage-backed Securities - Commercial [Member]
Schedule of Investments [Line Items]
Available for sale debt securities, Amortized Cost	2,435	2,490
Available for sale debt securities, Gross Unrealized/Unrecognized Gains		123
Available for sale debt securities, Gross Unrealized/Unrecognized Losses	(32)
Available for sale debt securities, Fair Value	2,403	2,613
Held to maturity debt securities, Amortized Cost	89,033	72,879
Held to maturity debt securities, Gross Unrealized/Unrecognized Gains	62	937
Held to maturity debt securities, Gross Unrealized/Unrecognized Losses	(6,274)	(622)
Held to maturity debt securities, Fair Value	82,821	73,194
Mortgage-backed Securities - Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Held to maturity debt securities, Amortized Cost	26,076	33,300
Held to maturity debt securities, Gross Unrealized/Unrecognized Gains	2	376
Held to maturity debt securities, Gross Unrealized/Unrecognized Losses	(1,373)	(328)
Held to maturity debt securities, Fair Value	$ 24,705	$ 33,348