FAIR VALUE - ASSETS MEASURED ON NONRECURRING BASIS - NARRATIVE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Related allowance on impaired loans	$ 651		$ 651		$ 692
Securities held-to-maturity	0		0		202,677
Held-to-maturity securities, impairment charged to other comprehensive income	386	$ 998	7,143	$ 2,636
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held-to-maturity					125,262
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held-to-maturity					199,174
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, fair value	33,301		33,301		32,069
Related allowance on impaired loans	651		651
Other real estate owned and foreclosed assets, fair value	981		981		252
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, fair value	33,301		33,301		32,069
Other real estate owned and foreclosed assets, fair value	981		981		252
Nonrecurring | Nonperforming
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, charge-offs			1,072
Impaired loans, life to date charge-offs	3,447		3,447
Impaired financing receivable, interest payments applied to principal			1,070
Impaired loans, additional provision for loan losses			4,517
Nonrecurring | Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, charge-offs	0
Nonrecurring | Non-Agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held-to-maturity					79,164
Held-to-maturity securities, impairment charged to income				102
Held-to-maturity securities, impairment charged to other comprehensive income				$ 4,351
Nonrecurring | Non-Agency RMBS | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held-to-maturity					$ 79,164
Nonrecurring | Non-Agency RMBS | Carrying Amount | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held-to-maturity	$ 0		$ 0