Investment Securities - Investments with unrealized losses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Fair Value
Less than 12 Months	$ 78,409	$ 37,433
12 Months or More	2,407	2,043
Total Fair Value	80,816	39,476
Unrealized Losses
Less than 12 Months	(1,021)	(254)
12 Months or More	(53)	(43)
Total Unrealized Losses	(1,074)	(297)
Mortgage-backed securities
Fair Value
Less than 12 Months	43,152	22,082
Total Fair Value	43,152	22,082
Unrealized Losses
Less than 12 Months	(374)	(104)
Total Unrealized Losses	(374)	(104)
U.S. agency collateralized mortgage obligations
Fair Value
Less than 12 Months	10,613	1,513
12 Months or More	2,407	1,129
Total Fair Value	13,020	2,642
Unrealized Losses
Less than 12 Months	(202)	(14)
12 Months or More	(53)	(19)
Total Unrealized Losses	(255)	(33)
U.S. government agency securities
Fair Value
Less than 12 Months	6,896	4,922
12 Months or More		914
Total Fair Value	6,896	5,836
Unrealized Losses
Less than 12 Months	(56)	(49)
12 Months or More		(24)
Total Unrealized Losses	(56)	(73)
Municipal bonds
Fair Value
Less than 12 Months	17,748	3,694
Total Fair Value	17,748	3,694
Unrealized Losses
Less than 12 Months	(389)	(10)
Total Unrealized Losses	$ (389)	(10)
Corporate bonds
Fair Value
Less than 12 Months		5,222
Total Fair Value		5,222
Unrealized Losses
Less than 12 Months		(77)
Total Unrealized Losses		$ (77)