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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 3 Months Ended | 12 Months Ended |  |
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Sep. 30, 2019 USD ($) $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares | Sep. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 $ / shares | Mar. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares | Sep. 30, 2017 $ / shares | Jun. 30, 2017 $ / shares | Mar. 31, 2017 $ / shares | Dec. 31, 2016 $ / shares | Sep. 30, 2019 USD ($) segment joint_venture $ / shares | Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | Oct. 01, 2019 USD ($) | Oct. 01, 2018 USD ($)
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) | $ 33,900,000 |  |  |  | $ 16,500,000 |  |  |  |  |  |  |  | $ 33,900,000 | $ 16,500,000 |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, Net earnings recognized |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000.0 |  |  |  |
Federal funds sold | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Loans outstanding with individuals | 5,100,000 |  |  |  | 700,000 |  |  |  |  |  |  |  | $ 5,100,000 | 700,000 |  |  |
Number of joint venture LLC's | joint_venture |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Joint venture ownership interest in each of the joint ventures |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |
Retained earnings | 252,813,000 |  |  |  | 213,048,000 |  |  |  |  |  |  |  | $ 252,813,000 | 213,048,000 |  |  |
SECURITIES [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded balance | 10,582,000 |  |  |  |  |  |  |  |  |  |  |  | 10,582,000 |  |  |  |
Other-than-temporary impairment recorded |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | $ 0 |  |
Transfers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate unpaid balance of loans serviced for others | $ 175,500,000 |  |  |  | $ 134,000,000.0 |  |  |  |  |  |  |  | $ 175,500,000 | $ 134,000,000.0 |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ / shares | $ 0.53 | $ 0.75 | $ 0.81 | $ 0.39 | $ 0.24 | $ 0.22 | $ 1.07 | $ 0.15 | $ 0.07 | $ 0.35 | $ 1.15 | $ 0.05 | $ 2.49 | $ 1.68 | $ 1.62 |  |
Diluted (in dollars per share) | $ / shares | $ 0.53 | $ 0.75 | $ 0.81 | $ 0.39 | $ 0.24 | $ 0.22 | $ 1.06 | $ 0.15 | $ 0.07 | $ 0.35 | $ 1.14 | $ 0.05 | $ 2.49 | $ 1.67 | $ 1.61 |  |
Net change in loans receivable |  |  |  |  |  |  |  |  |  |  |  |  | $ 591,785,000 | $ 493,381,000 | $ 274,840,000 |  |
FRB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest bearing deposits | $ 11,300,000 |  |  |  |  |  |  |  |  |  |  |  | 11,300,000 |  |  |  |
FHLB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest bearing deposits | $ 6,000,000.0 |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000.0 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 5.00% |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |
ALLOWANCE FOR LOAN LOSSES [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Look back period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 25.00% |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |
ALLOWANCE FOR LOAN LOSSES [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Look back period |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,500,000 |
Operating lease liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (28,400,000) |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,502,000
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments | $ 20,600,000 |  |  |  |  |  |  |  |  |  |  |  | $ 20,600,000 |  |  |  |
Other Assets | Accounting Standards Update 2016-01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative Investment | 6,500,000 |  |  |  |  |  |  |  |  |  |  |  | 6,500,000 |  |  |  |
Fair Value Measured at Net Asset Value Per Share | Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments | $ 1,700,000 |  |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 |  |  |  |
Buildings | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premises, furniture and equipment, estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Buildings | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premises, furniture and equipment, estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 40 years |  |  |  |
Leasehold Improvements | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premises, furniture and equipment, estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |
Leasehold Improvements | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premises, furniture and equipment, estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |
Retained Earnings | Accounting Standards Update 2016-01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 475,000
Retained Earnings | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,502,000

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