Investment Securities - Investments with Unrealized Loss Positions for Held to maturity (Details) - USD ($)	Sep. 30, 2021	Jun. 30, 2021
Schedule of Held-to-maturity Securities [Line Items]
Unrealized Holding Losses Less Than 12 Months, Fair Value	$ 119,650,000	$ 84,600,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses	746,000	810,000
Unrealized Holding Losses 12 Months or More, Fair Value	8,787,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses	355,000	0
Unrealized Holding Losses Total, Fair Value	128,437,000	84,600,000
Unrealized Holding Losses Total, Unrealized Losses	1,101,000	810,000
U.S. government sponsored enterprise MBS
Schedule of Held-to-maturity Securities [Line Items]
Unrealized Holding Losses Less Than 12 Months, Fair Value	119,650,000	84,600,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses	746,000	810,000
Unrealized Holding Losses 12 Months or More, Fair Value	8,787,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses	355,000
Unrealized Holding Losses Total, Fair Value	128,437,000	84,600,000
Unrealized Holding Losses Total, Unrealized Losses	$ 1,101,000	810,000
U.S. SBA securities
Schedule of Held-to-maturity Securities [Line Items]
Unrealized Holding Losses Less Than 12 Months, Fair Value		0
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses		0
Unrealized Holding Losses 12 Months or More, Fair Value		0
Unrealized Holding Losses 12 Months or More, Unrealized Losses		0
Unrealized Holding Losses Total, Fair Value		0
Unrealized Holding Losses Total, Unrealized Losses		$ 0