Borrowings - Table Narrative (Details)	Mar. 31, 2020	Jun. 30, 2019
FHLB fixed rate advance (2.45%, matures 7/1/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.45%
FHLB fixed rate advance (2.43%, matures 7/2/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.43%
FHLB fixed rate advance (2.45%, matures 7/3/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.45%
FHLB fixed rate advance (2.43%, matures 7/3/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.43%
FHLB fixed rate advance (2.649%, matures 7/23/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.649%
FHLB fixed rate advance (2.649%, matures 7/24/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.649%
FHLB fixed rate advance (2.647%, matures 7/25/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.647%
FHLB fixed rate advance (0.28%, matures 4/2/20)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate	0.28%
FHLB fixed rate advance (0.35%, matures 4/23/20)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate	0.35%
FHLB fixed rate advance (1.07%, matures 6/2/20)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate	1.07%
FHLB fixed rate advance (0.74%, matures 6/12/20)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate	0.74%
FHLB fixed rate advance (0.61%, matures 9/11/20)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate	0.61%