Accounting for Certain Acquired Loans - Balance of loans receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Commercial loans
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment	$ 5,571	$ 8,381
Construction Real Estate
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment	1,312	1,397
Outstanding Balance
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment	27,499	36,368
Carrying Amount of Acquired Loans
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment	21,799	28,547
Net of fair value adjustment	5,700	7,821
Residential Real Estate
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment	1,508	1,921
Commercial
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment	$ 19,108	$ 24,669