FAIR VALUE - LEVEL 3 ASSETS MEASURED ON RECURRING BASIS (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issues, Settlements [Abstract]
Other-than-temporary impairment	$ 0	$ (821)	$ (156)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	24,055	29,148
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Total gains or losses for the period - Included in other comprehensive income	617	766
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issues, Settlements [Abstract]
Purchases	13,697	2,394
Issues	0	0
Sales	0	(2,058)
Settlements	(2,310)	(2,172)
Other-than-temporary impairment	0	(821)
Closing balance	36,423	24,055	29,148
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	364	(3,202)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Included in earnings—Sale of securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses for the period - Included in earnings		(133)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Included in earnings—Fair value gain(loss) on trading securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses for the period - Included in earnings		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Included in earnings—Mortgage banking income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses for the period - Included in earnings	364	(3,069)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities- Available-for- Sale: Non- Agency RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	13,025	17,443
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Total gains or losses for the period - Included in other comprehensive income	617	766
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issues, Settlements [Abstract]
Purchases	7,000	0
Issues	0	0
Sales	0	(2,058)
Settlements	(2,310)	(2,172)
Other-than-temporary impairment	0	(821)
Closing balance	18,332	13,025	17,443
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	0	(133)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities- Available-for- Sale: Non- Agency RMBS | Included in earnings—Sale of securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses for the period - Included in earnings		(133)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities- Available-for- Sale: Non- Agency RMBS | Included in earnings—Fair value gain(loss) on trading securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses for the period - Included in earnings		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities- Available-for- Sale: Non- Agency RMBS | Included in earnings—Mortgage banking income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses for the period - Included in earnings	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	9,784	10,752
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Total gains or losses for the period - Included in other comprehensive income	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issues, Settlements [Abstract]
Purchases	6,697	2,394
Issues	0	0
Sales	0	0
Settlements	0	0
Other-than-temporary impairment	0	0
Closing balance	10,675	9,784	10,752
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	(5,806)	(3,362)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Included in earnings—Sale of securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses for the period - Included in earnings		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Included in earnings—Fair value gain(loss) on trading securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses for the period - Included in earnings		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Included in earnings—Mortgage banking income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses for the period - Included in earnings	(5,806)	(3,362)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivative Instruments, net
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	1,246	953
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Total gains or losses for the period - Included in other comprehensive income	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issues, Settlements [Abstract]
Purchases	0	0
Issues	0	0
Sales	0	0
Settlements	0	0
Other-than-temporary impairment	0	0
Closing balance	7,416	1,246	$ 953
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	6,170	293
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivative Instruments, net | Included in earnings—Sale of securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses for the period - Included in earnings		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivative Instruments, net | Included in earnings—Fair value gain(loss) on trading securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses for the period - Included in earnings		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivative Instruments, net | Included in earnings—Mortgage banking income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses for the period - Included in earnings	$ 6,170	$ 293