Investment Securities - Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Jun. 30, 2023
Before Adoption
Amortized Cost		$ 195,488
Gross Unrealized Gains	$ 54	161
Gross Unrealized Losses	(28,698)	(30,522)
Fair value		165,127
After adoption
Amortized Cost	185,287
Gross Unrealized Gains	54	161
Gross Unrealized Losses	(28,698)	(30,522)
Fair value	156,643
Before adoption
Securities held to maturity		99,690
Gross Unrealized Gains	1
Gross Unrealized Losses	(16,229)	(17,377)
Fair value	78,643	82,313
After adoption
Securities held to maturity	94,871
Gross Unrealized Gains	1
Gross Unrealized Losses	(16,229)	(17,377)
Fair value	78,643	82,313
Allowance for credit losses	0
Mortgage-backed securities
Before Adoption
Amortized Cost		124,252
Gross Unrealized Gains	54	21
Gross Unrealized Losses	(17,164)	(17,517)
Fair value		106,756
After adoption
Amortized Cost	118,085
Gross Unrealized Gains	54	21
Gross Unrealized Losses	(17,164)	(17,517)
Fair value	100,975
Before adoption
Securities held to maturity		94,648
Gross Unrealized Losses	(16,195)	(17,275)
Fair value	73,161	77,373
After adoption
Securities held to maturity	89,356
Gross Unrealized Losses	(16,195)	(17,275)
Fair value	73,161	77,373
U.S. agency collateralized mortgage obligations
Before Adoption
Amortized Cost		10,074
Gross Unrealized Losses	(1,695)	(1,782)
Fair value		8,292
After adoption
Amortized Cost	9,188
Gross Unrealized Losses	(1,695)	(1,782)
Fair value	7,493
U.S. government agency securities
Before Adoption
Amortized Cost		3,881
Gross Unrealized Gains		140
Gross Unrealized Losses	(82)	(89)
Fair value		3,932
After adoption
Amortized Cost	794
Gross Unrealized Gains		140
Gross Unrealized Losses	(82)	(89)
Fair value	712
Before adoption
Securities held to maturity		4,982
Gross Unrealized Gains	1
Gross Unrealized Losses	(34)	(102)
Fair value	5,434	4,880
After adoption
Securities held to maturity	5,467
Gross Unrealized Gains	1
Gross Unrealized Losses	(34)	(102)
Fair value	5,434	4,880
Municipal bonds
Before Adoption
Amortized Cost		20,081
Gross Unrealized Losses	(4,964)	(5,102)
Fair value		14,979
After adoption
Amortized Cost	20,020
Gross Unrealized Losses	(4,964)	(5,102)
Fair value	15,056
Before adoption
Securities held to maturity		60
Fair value	48	60
After adoption
Securities held to maturity	48
Fair value	48	60
Corporate bonds
Before Adoption
Amortized Cost		37,200
Gross Unrealized Losses	(4,793)	(6,032)
Fair value		31,168
After adoption
Amortized Cost	37,200
Gross Unrealized Losses	(4,793)	$ (6,032)
Fair value	$ 32,407