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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 05, 2018 | Sep. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 $ / shares | Mar. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares | Sep. 30, 2017 USD ($) $ / shares | Jun. 30, 2017 $ / shares | Mar. 31, 2017 $ / shares | Dec. 31, 2016 $ / shares | Sep. 30, 2016 $ / shares | Jun. 30, 2016 $ / shares | Mar. 31, 2016 $ / shares | Dec. 31, 2015 $ / shares | Sep. 30, 2018 USD ($) segment joint_venture $ / shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares | Oct. 01, 2018 USD ($)
PRINCIPLES OF CONSOLIDATION [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in subsidiary |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
NATURE OF BUSINESS AND INDUSTRY SEGMENT INFORMATION [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reporting segments | segment |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
CASH AND CASH EQUIVALENTS AND FEDERAL FUNDS SOLD [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terms of FHLB advances |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |
Reserve balances in cash or on deposit with FRB (Federal Reserve Bank) |  | $ 16,500 |  |  |  | $ 1,500 |  |  |  |  |  |  |  | $ 16,500 |  | $ 1,500 |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of joint venture LLC's | joint_venture |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |
Joint venture ownership interest in each of the joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |
Retained earnings |  | 213,048 |  |  |  | 167,164 |  |  |  |  |  |  |  | $ 213,048 |  | 167,164 |  |  |  |
SECURITIES [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded balance |  | 5,413 |  |  |  | 0 |  |  |  |  |  |  |  | 5,413 |  | 0 |  |  |  |
Other than temporary impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | $ 0 |  |
Transfers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate unpaid balance of loans serviced for others |  | $ 134,000 |  |  |  | $ 21,800 |  |  |  |  |  |  |  | $ 134,000 |  | $ 21,800 |  |  |  |
ALLOWANCE FOR LOAN LOSSES [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Look back period |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ / shares |  | $ 0.24 | $ 0.22 | $ 1.07 | $ 0.15 | $ 0.07 | $ 0.35 | $ 1.15 | $ 0.05 | $ 0.23 | $ 0.35 | $ 0.57 | $ 0.16 | $ 1.68 | [1] | $ 1.62 | [1] | $ 1.31 | [1] |
Diluted (in dollars per share) | $ / shares |  | $ 0.24 | $ 0.22 | $ 1.06 | $ 0.15 | $ 0.07 | $ 0.35 | $ 1.14 | $ 0.05 | $ 0.23 | $ 0.35 | $ 0.56 | $ 0.16 | $ 1.67 | [1] | $ 1.61 | [1] | $ 1.30 | [1] |
Net change in loans receivable |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 493,381 |  | $ 274,840 |  | $ 217,985 |  |
FRB [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest bearing deposits |  | $ 4,200 |  |  |  |  |  |  |  |  |  |  |  | 4,200 |  |  |  |  |  |
FHLB [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest bearing deposits |  | $ 16,000 |  |  |  |  |  |  |  |  |  |  |  | $ 16,000 |  |  |  |  |  |
Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buildings [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premises, furniture and equipment, estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Buildings [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premises, furniture and equipment, estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |  |
Leasehold Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premises, furniture and equipment, estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |
Leasehold Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premises, furniture and equipment, estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000
[1] | All share and per share data for all periods presented has been adjusted to reflect the 3-for-1 forward stock split of the Company's common stock effected by the Company on October 4, 2018.

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