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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended												12 Months Ended
	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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