Investment Securities - Schedule of amortized cost and estimated fair value of Held to maturity investments (Details) - USD ($) $ in Thousands	Sep. 30, 2021		Jun. 30, 2021
Held to maturity
Amortized Cost	$ 205,821		$ 223,306
Gross Unrealized Gains	1,700		2,225
Gross Unrealized (Losses)	(1,101)		(810)
Estimated Fair Value	206,420		224,721
Carrying Value	205,821		223,306
U.S. government sponsored enterprise MBS
Held to maturity
Amortized Cost	203,749	[1]	220,448
Gross Unrealized Gains	1,689	[1]	2,209
Gross Unrealized (Losses)	(1,101)	[1]	(810)
Estimated Fair Value	204,337	[1]	221,847
U.S. SBA securities
Held to maturity
Amortized Cost	1,272	[2]	1,858
Gross Unrealized Gains	11	[2]	16
Gross Unrealized (Losses)	0	[2]	0
Estimated Fair Value	1,283	[2]	1,874
Certificate of deposits
Held to maturity
Amortized Cost	800		1,000
Gross Unrealized Gains	0		0
Gross Unrealized (Losses)	0		0
Estimated Fair Value	$ 800		$ 1,000

[1] Mortgage-Backed Securities (“MBS”).

[2] Small Business Administration (“SBA”).