Investment Securities - Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023
Before Adoption
Amortized Cost		$ 195,488
Gross Unrealized Gains	$ 142	161
Gross Unrealized Losses	(36,460)	(30,522)
Fair value		165,127
After adoption
Amortized Cost	192,415
Gross Unrealized Gains	142	161
Gross Unrealized Losses	(36,460)	(30,522)
Fair value	156,097
Before adoption
Securities held to maturity		99,690
Gross Unrealized Losses	(20,691)	(17,377)
Fair value	76,853	82,313
After adoption
Securities held to maturity	97,544
Gross Unrealized Losses	(20,691)	(17,377)
Fair value	76,853	82,313
Allowance for credit losses	0
Mortgage-backed securities
Before Adoption
Amortized Cost		124,252
Gross Unrealized Gains		21
Gross Unrealized Losses	(22,631)	(17,517)
Fair value		106,756
After adoption
Amortized Cost	121,608
Gross Unrealized Gains		21
Gross Unrealized Losses	(22,631)	(17,517)
Fair value	98,977
Before adoption
Securities held to maturity		94,648
Gross Unrealized Losses	(20,607)	(17,275)
Fair value	71,887	77,373
After adoption
Securities held to maturity	92,494
Gross Unrealized Losses	(20,607)	(17,275)
Fair value	71,887	77,373
U.S. agency collateralized mortgage obligations
Before Adoption
Amortized Cost		10,074
Gross Unrealized Losses	(2,083)	(1,782)
Fair value		8,292
After adoption
Amortized Cost	9,903
Gross Unrealized Losses	(2,083)	(1,782)
Fair value	7,820
U.S. government agency securities
Before Adoption
Amortized Cost		3,881
Gross Unrealized Gains	142	140
Gross Unrealized Losses	(83)	(89)
Fair value		3,932
After adoption
Amortized Cost	3,643
Gross Unrealized Gains	142	140
Gross Unrealized Losses	(83)	(89)
Fair value	3,702
Before adoption
Securities held to maturity		4,982
Gross Unrealized Losses	(84)	(102)
Fair value	4,906	4,880
After adoption
Securities held to maturity	4,990
Gross Unrealized Losses	(84)	(102)
Fair value	4,906	4,880
Municipal bonds
Before Adoption
Amortized Cost		20,081
Gross Unrealized Losses	(6,091)	(5,102)
Fair value		14,979
After adoption
Amortized Cost	20,061
Gross Unrealized Losses	(6,091)	(5,102)
Fair value	13,970
Before adoption
Securities held to maturity		60
Fair value	60	60
After adoption
Securities held to maturity	60
Fair value	60	60
Corporate bonds
Before Adoption
Amortized Cost		37,200
Gross Unrealized Losses	(5,572)	(6,032)
Fair value		31,168
After adoption
Amortized Cost	37,200
Gross Unrealized Losses	(5,572)	$ (6,032)
Fair value	$ 31,628