Securities - Gross Unrealized Losses and Fair Value, Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 54,160	$ 66,401
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	667	883
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or more, Fair Value	5,114	790
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or more, Unrealized Losses	338	258
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	59,274	67,191
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	1,005	1,141
US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	2,716	3,177
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	36	40
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,716	3,177
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	36	40
Corporate Obligations
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	6,381	9,331
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	84	79
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or more, Fair Value	715	720
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or more, Unrealized Losses	262	256
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	7,096	10,051
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	346	335
Total MBS and CMOs
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	45,063	53,893
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	547	764
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or more, Fair Value	4,399	70
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or more, Unrealized Losses	76	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	49,462	53,963
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	$ 623	$ 766