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LOANS AND LEASES, NET - Narrative and Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans transferred to held for sale |  |  | $ 39,452 | $ 0 |
Loans transferred to held for sale |  |  | 0 | 0 |
Originations of Loans Held-for-sale |  |  | 42,961 | 0 |
Increase in loans held for sale |  |  | $ (8,760) | 0 |
Percentage of specific allowance for losses |  |  | 100.00% |  |
Loans and Leases Receivable, Net Amount | $ 3,389,308 |  | $ 3,389,308 |  | $ 2,931,699
Proceeds from sales |  |  | 36,461 | 0 |
Gain (Loss) on Sales of Loans, Net |  |  | 1,650 | 0 |
Financing Receivable |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sales | $ 28,051 | $ 0 | $ 34,904 | $ 0 |
Residential Mortgage | 1-4 Family Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Mortgage Loan, Required Mortgage Insurance, Loan-To-Value Ratio Threshold Exposure, Maximum |  |  | 80.00% |  |
Residential Mortgage | Maximum | 1-4 Family Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity period of loans receivable |  |  | 30 years |  |
Mortgage Loan, Loan-To-Value Ratio, Appraised Value |  |  | 100.00% |  |
Mortgage Loan, Loan-To-Value Ratio, Actual Majority of Loans |  |  | 80.00% |  |
Fixed Rate | Maximum | 1-4 Family Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity period of loans receivable |  |  | 30 years |  |
Fixed Rate | Financing Receivable | Maximum | Agricultural real estate and operating |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity period of loans receivable |  |  | 1 year |  |
Fixed Rate | Financing Receivable | Maximum | Agricultural Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity period of loans receivable |  |  | 10 years |  |
Mortgage Loan, Loan-To-Value Ratio, Appraised Value |  |  | 75.00% |  |
Fixed Rate | Financing Receivable | Minimum | Agricultural Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity period of loans receivable |  |  | 5 years |  |
Adjustable Rate | Maximum | 1-4 Family Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity period of loans receivable |  |  | 10 years |  |
Adjustable Rate | Minimum | 1-4 Family Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity period of loans receivable |  |  | 5 years |  |
Adjustable Rate | Financing Receivable | Maximum | Agricultural Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity period of loans receivable |  |  | 25 years |  |
Adjustable Rate | Financing Receivable | Minimum | Agricultural Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maturity period of loans receivable |  |  | 20 years |  |

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