Investment Securities - Investments with unrealized losses (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2021
Fair Value
Less than 12 Months	$ 119,948	$ 78,409
12 Months or More	29,734	2,407
Total Fair Value	149,682	80,816
Unrealized Losses
Less than 12 Months	(8,843)	(1,021)
12 Months or More	(3,203)	(53)
Total Unrealized Losses	(12,046)	(1,074)
Fair Value
Less than 12 Months	95,102
Total Fair Value	95,102
Unrealized Losses
Less than 12 Months	(9,125)
Total Unrealized Losses	(9,125)
Less than 12 Months Fair Value	215,050
12 Months or More Fair Value	29,734
Total Fair Value	244,784
Less than 12 Months Unrealized Losses	(17,968)
12 Months or More Unrealized Losses	(3,203)
Total Unrealized Losses	(21,171)
Mortgage-backed securities
Fair Value
Less than 12 Months	87,009	43,152
12 Months or More	8,536
Total Fair Value	95,545	43,152
Unrealized Losses
Less than 12 Months	(6,472)	(374)
12 Months or More	(959)
Total Unrealized Losses	(7,431)	(374)
Fair Value
Less than 12 Months	95,102
Total Fair Value	95,102
Unrealized Losses
Less than 12 Months	(9,125)
Total Unrealized Losses	(9,125)
U.S. agency collateralized mortgage obligations
Fair Value
Less than 12 Months	3,200	10,613
12 Months or More	7,552	2,407
Total Fair Value	10,752	13,020
Unrealized Losses
Less than 12 Months	(370)	(202)
12 Months or More	(670)	(53)
Total Unrealized Losses	(1,040)	(255)
U.S. government agency securities
Fair Value
Less than 12 Months	1,280	6,896
12 Months or More	4,404
Total Fair Value	5,684	6,896
Unrealized Losses
Less than 12 Months	(7)	(56)
12 Months or More	(39)
Total Unrealized Losses	(46)	(56)
Municipal bonds
Fair Value
Less than 12 Months	8,214	17,748
12 Months or More	9,242
Total Fair Value	17,456	17,748
Unrealized Losses
Less than 12 Months	(1,189)	(389)
12 Months or More	(1,535)
Total Unrealized Losses	(2,724)	$ (389)
Corporate bonds
Fair Value
Less than 12 Months	20,245
Total Fair Value	20,245
Unrealized Losses
Less than 12 Months	(805)
Total Unrealized Losses	$ (805)