LOANS, LEASES & ALLOWANCE FOR LOAN AND LEASE LOSSES - LOANS NARRATIVE (Details)	12 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan
Financing Receivable, Impaired [Line Items]
Write offs on impaired loans	$ 7,200,000
Impaired loans with no specific allowance	87,900,000
Average carrying value of impaired loans	60,600,000	$ 39,500,000
Loans past due ninety days or more and still accruing	$ 0	$ 0
Loans with related parties, number of loans refinanced | loan		1
Loans with related parties, amount of loans refinanced		$ 1,300,000
Number of new related party loans | loan	5
Amount received from new related party loans	$ 8,500,000
Principal payments received on related party loans	7,900,000	500,000
Ending balance of related party loans	14,500,000	13,300,000
Interest earned on related party loans	200,000	300,000
Purchased loans serviced by others, amount	$ 49,400,000	$ 57,700,000
Purchased loans serviced by others, percent	0.46%	0.61%
Loans with granted forbearance, COVID-19 Impact	$ 95,800,000
Fixed Interest Rate
Financing Receivable, Impaired [Line Items]
Percent of loans by interest rate type	15.71%
Adjustable Interest Rate
Financing Receivable, Impaired [Line Items]
Percent of loans by interest rate type	84.29%
Single Family Mortgage Secured
Financing Receivable, Impaired [Line Items]
LTV ratio	80.00%
Single Family Mortgage Secured | Minimum
Financing Receivable, Impaired [Line Items]
Loan term (in years)	15 years
Single Family Mortgage Secured | Maximum
Financing Receivable, Impaired [Line Items]
Loan term (in years)	30 years
Commercial real estate | Minimum
Financing Receivable, Impaired [Line Items]
LTV ratio	65.00%
Commercial real estate | Maximum
Financing Receivable, Impaired [Line Items]
LTV ratio	80.00%
Auto and RV secured
Financing Receivable, Impaired [Line Items]
Loan deferrals, COVID-19 impact	$ 28,200,000
Unsecured consumer loan
Financing Receivable, Impaired [Line Items]
Loan deferrals, COVID-19 impact	$ 2,700,000
Commercial & Industrial
Financing Receivable, Impaired [Line Items]
Interest-only payment period (in months)	3 months