Investment Securities - Investments with unrealized losses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Fair Value
Less than 12 Months	$ 34,786	$ 37,433
12 Months or More	8,924	2,043
Total Fair Value	43,710	39,476
Unrealized Losses
Less than 12 Months	271	254
12 Months or More	95	43
Total Unrealized Losses	366	297
Mortgage-backed securities
Fair Value
Less than 12 Months	16,027	22,082
12 Months or More	6,207
Total Fair Value	22,234	22,082
Unrealized Losses
Less than 12 Months	82	104
12 Months or More	42
Total Unrealized Losses	124	104
U.S. agency collateralized mortgage obligations
Fair Value
Less than 12 Months	352	1,513
12 Months or More	1,061	1,129
Total Fair Value	1,413	2,642
Unrealized Losses
Less than 12 Months	5	14
12 Months or More	35	19
Total Unrealized Losses	40	33
U.S. government agency securities
Fair Value
Less than 12 Months	9,006	4,922
12 Months or More	1,656	914
Total Fair Value	10,662	5,836
Unrealized Losses
Less than 12 Months	86	49
12 Months or More	18	24
Total Unrealized Losses	104	73
Municipal bonds
Fair Value
Less than 12 Months	9,401	3,694
Total Fair Value	9,401	3,694
Unrealized Losses
Less than 12 Months	98	10
Total Unrealized Losses	$ 98	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