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CREDIT DISCLSOURES - Allowance for Loan Losses and Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2017
Allowance for Credit Losses [Roll Forward]              
Beginning balance $ 8,862 $ 6,415 $ 7,534 $ 5,635      
Provision (recovery) for loan losses 18,343 8,648 19,411 9,492      
Charge offs (339) (490) (499) (609)      
Recoveries 212 29 632 84      
Ending balance 27,078 14,602 27,078 14,602      
Ending balance: individually evaluated for impairment         $ 25   $ 65
Ending balance: collectively evaluated for impairment         27,053   14,537
Total 8,862 6,415 7,534 5,635 27,078 $ 7,534 14,602
Loans:              
Ending balance: individually evaluated for impairment         4,013   3,348
Ending balance: collectively evaluated for impairment         1,515,683   1,149,034
Total Loans Receivable         1,519,696 1,326,832 1,152,382
1-4 Family Real Estate [Member]              
Allowance for Credit Losses [Roll Forward]              
Beginning balance 654 654 803 654      
Provision (recovery) for loan losses 226 (358) 108 (358)      
Charge offs 0 0 (31) 0      
Recoveries 3 0 3 0      
Ending balance 883 296 883 296      
Ending balance: individually evaluated for impairment         25   12
Ending balance: collectively evaluated for impairment         858   284
Total 654 654 803 654 883 803 296
Loans:              
Ending balance: individually evaluated for impairment         230   248
Ending balance: collectively evaluated for impairment         205,764   178,062
Total Loans Receivable         205,994 196,706 178,310
Commercial and Multi-Family Real Estate [Member]              
Allowance for Credit Losses [Roll Forward]              
Beginning balance 3,034 1,912 2,670 2,198      
Provision (recovery) for loan losses 870 (170) 1,234 (456)      
Charge offs 0 0 0 0      
Recoveries 0 0 0 0      
Ending balance 3,904 1,742 3,904 1,742      
Ending balance: individually evaluated for impairment         0   0
Ending balance: collectively evaluated for impairment         3,904   1,742
Total 3,034 1,912 2,670 2,198 3,904 2,670 1,742
Loans:              
Ending balance: individually evaluated for impairment         702   1,144
Ending balance: collectively evaluated for impairment         684,755   471,914
Total Loans Receivable         685,457 585,510 473,058
Agricultural Real Estate [Member]              
Allowance for Credit Losses [Roll Forward]              
Beginning balance 1,180 476 1,390 142      
Provision (recovery) for loan losses (1,034) 1,048 (1,244) 1,382      
Charge offs 0 0 0 0      
Recoveries 0 0 0 0      
Ending balance 146 1,524 146 1,524      
Ending balance: individually evaluated for impairment         0   0
Ending balance: collectively evaluated for impairment         146   1,524
Total 1,180 476 1,390 142 146 1,390 1,524
Loans:              
Ending balance: individually evaluated for impairment         0   582
Ending balance: collectively evaluated for impairment         36,460   61,840
Total Loans Receivable         36,460 61,800 62,422
Consumer [Member]              
Allowance for Credit Losses [Roll Forward]              
Beginning balance 670 47 6 51      
Provision (recovery) for loan losses 17,401 7,658 17,698 7,631      
Charge offs 0 0 0 0      
Recoveries 3 1 370 24      
Ending balance 18,074 7,706 18,074 7,706      
Ending balance: individually evaluated for impairment         0   0
Ending balance: collectively evaluated for impairment         18,074   7,706
Total 670 47 6 51 18,074 6 7,706
Loans:              
Ending balance: individually evaluated for impairment         144   0
Ending balance: collectively evaluated for impairment         281,227   182,156
Total Loans Receivable         281,371 163,004 182,156
Commercial Operating [Member]              
Allowance for Credit Losses [Roll Forward]              
Beginning balance 894 813 158 117      
Provision (recovery) for loan losses 816 304 1,506 995      
Charge offs 0 (350) 0 (350)      
Recoveries 6 0 52 5      
Ending balance 1,716 767 1,716 767      
Ending balance: individually evaluated for impairment         0   53
Ending balance: collectively evaluated for impairment         1,716   714
Total 894 813 158 117 1,716 158 767
Loans:              
Ending balance: individually evaluated for impairment         0   302
Ending balance: collectively evaluated for impairment         47,461   33,592
Total Loans Receivable         47,461 35,759 33,894
Agricultural Operating [Member]              
Allowance for Credit Losses [Roll Forward]              
Beginning balance 804 1,341 1,184 1,332      
Provision (recovery) for loan losses (239) 8 (619) 4      
Charge offs 0 0 0 0      
Recoveries 54 0 54 13      
Ending balance 619 1,349 619 1,349      
Ending balance: individually evaluated for impairment         0   0
Ending balance: collectively evaluated for impairment         619   1,349
Total 804 1,341 1,184 1,332 619 1,184 1,349
Loans:              
Ending balance: individually evaluated for impairment         2,937   1,072
Ending balance: collectively evaluated for impairment         19,376   34,421
Total Loans Receivable         22,313 33,594 35,493
Commercial Insurance Premium Finance [Member]              
Allowance for Credit Losses [Roll Forward]              
Beginning balance 725 594 796 588      
Provision (recovery) for loan losses 214 115 265 226      
Charge offs (339) (140) (468) (259)      
Recoveries 146 28 153 42      
Ending balance 746 597 746 597      
Ending balance: individually evaluated for impairment         0   0
Ending balance: collectively evaluated for impairment         746   597
Total 725 594 796 588 746 796 597
Loans:              
Ending balance: individually evaluated for impairment         0   0
Ending balance: collectively evaluated for impairment         240,640   187,049
Total Loans Receivable         240,640 250,459 187,049
Unallocated [Member]              
Allowance for Credit Losses [Roll Forward]              
Beginning balance 901 578 527 553      
Provision (recovery) for loan losses 89 43 463 68      
Charge offs 0 0 0 0      
Recoveries 0 0 0 0      
Ending balance 990 621 990 621      
Ending balance: individually evaluated for impairment         0   0
Ending balance: collectively evaluated for impairment         990   621
Total $ 901 $ 578 $ 527 $ 553 990 $ 527 621
Loans:              
Ending balance: individually evaluated for impairment         0   0
Ending balance: collectively evaluated for impairment         0   0
Total Loans Receivable         $ 0   $ 0