Investment Securities - Investments with unrealized losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021
Fair Value
Less than 12 Months	$ 72,224	$ 78,409
12 Months or More	17,060	2,407
Total Fair Value	89,284	80,816
Unrealized Losses
Less than 12 Months	(1,301)	(1,021)
12 Months or More	(464)	(53)
Total Unrealized Losses	(1,765)	(1,074)
Fair Value
Less than 12 Months	37,669
Total Fair Value	37,669
Unrealized Losses
Less than 12 Months	(458)
Total Unrealized Losses	(458)
Less than 12 Months Fair Value	109,893
12 Months or More Fair Value	17,060
Total Fair Value	126,953
Less than 12 Months Unrealized Losses	(1,759)
12 Months or More Unrealized Losses	(464)
Total Unrealized Losses	(2,223)
Mortgage-backed securities
Fair Value
Less than 12 Months	45,290	43,152
12 Months or More	2,815
Total Fair Value	48,105	43,152
Unrealized Losses
Less than 12 Months	(643)	(374)
12 Months or More	(80)
Total Unrealized Losses	(723)	(374)
Fair Value
Less than 12 Months	37,669
Total Fair Value	37,669
Unrealized Losses
Less than 12 Months	(458)
Total Unrealized Losses	(458)
U.S. agency collateralized mortgage obligations
Fair Value
Less than 12 Months	6,795	10,613
12 Months or More	5,529	2,407
Total Fair Value	12,324	13,020
Unrealized Losses
Less than 12 Months	(102)	(202)
12 Months or More	(193)	(53)
Total Unrealized Losses	(295)	(255)
U.S. government agency securities
Fair Value
Less than 12 Months	171	6,896
12 Months or More	4,665
Total Fair Value	4,836	6,896
Unrealized Losses
Less than 12 Months	(1)	(56)
12 Months or More	(59)
Total Unrealized Losses	(60)	(56)
Municipal bonds
Fair Value
Less than 12 Months	14,993	17,748
12 Months or More	4,051
Total Fair Value	19,044	17,748
Unrealized Losses
Less than 12 Months	(530)	(389)
12 Months or More	(132)
Total Unrealized Losses	(662)	$ (389)
Corporate bonds
Fair Value
Less than 12 Months	4,975
Total Fair Value	4,975
Unrealized Losses
Less than 12 Months	(25)
Total Unrealized Losses	$ (25)