LOANS AND LEASES, NET - Asset Classification of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	$ 3,328,308	$ 2,944,989
Total Loans Receivable	3,328,308	2,944,989
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	3,174,479	2,783,536
Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	18,383	15,235
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	114,329	121,639
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	21,117	24,579
Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	2,149,243	1,846,283
Financing Receivable [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	2,031,007	1,716,336
Financing Receivable [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	109,185	116,334
Financing Receivable [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	9,051	13,613
Financing Receivable [Member] | Asset Based Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	554,072	477,917
Total Loans Receivable	554,072	477,917
Financing Receivable [Member] | Asset Based Lending [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	498,694	418,635
Financing Receivable [Member] | Asset Based Lending [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Asset Based Lending [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	53,007	57,877
Financing Receivable [Member] | Asset Based Lending [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	2,371	1,405
Financing Receivable [Member] | Factoring [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	284,912	284,221
Total Loans Receivable	284,912	284,221
Financing Receivable [Member] | Factoring [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	244,992	248,246
Financing Receivable [Member] | Factoring [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Factoring [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	38,240	32,644
Financing Receivable [Member] | Factoring [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,680	3,331
Financing Receivable [Member] | Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	290,889	265,315
Total Loans Receivable	290,889	265,315
Financing Receivable [Member] | Finance Leases Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	284,239	252,487
Financing Receivable [Member] | Finance Leases Portfolio Segment [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Finance Leases Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,650	3,951
Financing Receivable [Member] | Finance Leases Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	5,000	8,877
Financing Receivable [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	278,654	270,361
Total Loans Receivable	278,654	270,361
Financing Receivable [Member] | Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	278,654	270,361
Financing Receivable [Member] | Consumer [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Consumer [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Consumer [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Commercial Operating [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,617,880	1,509,849
Total Loans Receivable	1,617,880	1,509,849
Financing Receivable [Member] | Commercial Operating [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,499,644	1,379,902
Financing Receivable [Member] | Commercial Operating [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Commercial Operating [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	109,185	116,334
Financing Receivable [Member] | Commercial Operating [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	9,051	13,613
Financing Receivable [Member] | Consumer Credit Products [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	96,144	80,605
Total Loans Receivable	96,144	80,605
Financing Receivable [Member] | Consumer Credit Products [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	96,144	80,605
Financing Receivable [Member] | Consumer Credit Products [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Consumer Credit Products [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Consumer Credit Products [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Other Consumer Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	182,510	189,756
Total Loans Receivable	182,510	189,756
Financing Receivable [Member] | Other Consumer Finance [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	182,510	189,756
Financing Receivable [Member] | Other Consumer Finance [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Other Consumer Finance [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Other Consumer Finance [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Commercial Insurance Premium Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	330,712	337,877
Total Loans Receivable	330,712	337,877
Financing Receivable [Member] | Commercial Insurance Premium Finance [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	329,131	336,296
Financing Receivable [Member] | Commercial Insurance Premium Finance [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Commercial Insurance Premium Finance [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,581	1,581
Financing Receivable [Member] | Commercial Insurance Premium Finance [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | SBA/USDA [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	67,893	59,374
Total Loans Receivable	67,893	59,374
Financing Receivable [Member] | SBA/USDA [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	53,539	39,093
Financing Receivable [Member] | SBA/USDA [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | SBA/USDA [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	14,354	20,281
Financing Receivable [Member] | SBA/USDA [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Other Commercial Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	89,402	85,145
Total Loans Receivable	89,402	85,145
Financing Receivable [Member] | Other Commercial Finance [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	89,049	85,145
Financing Receivable [Member] | Other Commercial Finance [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Other Commercial Finance [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	353	0
Financing Receivable [Member] | Other Commercial Finance [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Tax Services [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	76,575	1,073
Total Loans Receivable	76,575	1,073
Financing Receivable [Member] | Tax Services [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	76,575	1,073
Financing Receivable [Member] | Tax Services [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Tax Services [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Tax Services [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Warehouse Agreement Borrowings [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	176,134	65,000
Total Loans Receivable	176,134	65,000
Financing Receivable [Member] | Warehouse Agreement Borrowings [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	176,134	65,000
Financing Receivable [Member] | Warehouse Agreement Borrowings [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Warehouse Agreement Borrowings [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Financing Receivable [Member] | Warehouse Agreement Borrowings [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Loans Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,179,065	1,098,706
Total Loans Receivable	1,179,065	1,098,706
Loans Receivable [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,143,472	1,067,200
Loans Receivable [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	18,383	15,235
Loans Receivable [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	5,144	5,305
Loans Receivable [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	12,066	10,966
Loans Receivable [Member] | 1-4 Family Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	256,341	247,318
Total Loans Receivable	256,341	247,318
Loans Receivable [Member] | 1-4 Family Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	254,458	246,463
Loans Receivable [Member] | 1-4 Family Real Estate [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,496	537
Loans Receivable [Member] | 1-4 Family Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	308	239
Loans Receivable [Member] | 1-4 Family Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	79	79
Loans Receivable [Member] | Commercial and Multi-Family Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	863,753	790,890
Total Loans Receivable	863,753	790,890
Loans Receivable [Member] | Commercial and Multi-Family Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	848,456	778,445
Loans Receivable [Member] | Commercial and Multi-Family Real Estate [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	15,297	12,251
Loans Receivable [Member] | Commercial and Multi-Family Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	194
Loans Receivable [Member] | Commercial and Multi-Family Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	0	0
Loans Receivable [Member] | Agricultural Operating [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	58,971	60,498
Total Loans Receivable	58,971	60,498
Loans Receivable [Member] | Agricultural Operating [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	40,558	42,292
Loans Receivable [Member] | Agricultural Operating [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,590	2,447
Loans Receivable [Member] | Agricultural Operating [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	4,836	4,872
Loans Receivable [Member] | Agricultural Operating [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	$ 11,987	$ 10,887