Borrowings (Details) - USD ($)	Sep. 30, 2019	Jun. 30, 2019
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	$ 28,600,000	$ 44,200,000
FHLB fixed rate advance (2.45%, matures 7/1/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	0	7,500,000
FHLB fixed rate advance (2.43%, matures 7/2/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	0	15,000,000
FHLB fixed rate advance (2.45%, matures 7/3/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	0	5,000,000
FHLB fixed rate advance (2.43%, matures 7/3/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	0	8,000,000
FHLB fixed rate advance (2.649%, matures 7/23/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	0	2,500,000
FHLB fixed rate advance (2.649%, matures 7/24/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	0	3,100,000
FHLB fixed rate advance (2.647%, matures 7/25/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	0	3,100,000
FHLB fixed rate advance (2.03%, matures 10/1/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	9,000,000	0
FHLB fixed rate advance (2.05%, matures 10/1/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	3,300,000	0
FHLB fixed rate advance (2.03%, matures 10/2/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	8,000,000	0
FHLB fixed rate advance (2.02%, matures 10/3/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	8,000,000	0
FHLB fixed rate advance (2.04%, matures 10/3/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank borrowings	$ 300,000	$ 0