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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Financial assets [Abstract]
Debt securities available for sale	$ 1,195,619	$ 1,272,493
Debt securities held to maturity	114,405	133,470
Level 1
Financial assets [Abstract]
Cash and cash equivalents	108,733	126,545
Debt securities available for sale	0	0
Debt securities held to maturity	0	0
Common equities and mutual funds	2,899	2,606
Non-marketable equity securities	0	0
Loans held for sale	0	0
Loans and leases receivable	0	0
Federal Home Loan Bank stock	0	0
Accrued interest receivable	16,958	20,400
Financial liabilities [Abstract]
Deposits	3,363,025	2,920,516
Overnight federal funds purchased	717,000	642,000
Federal Home Loan Bank advances	0	0
Other short- and long-term borrowings	0	0
Accrued interest payable	3,607	9,414
Level 2
Financial assets [Abstract]
Cash and cash equivalents	0	0
Debt securities available for sale	1,195,619	1,272,493
Debt securities held to maturity	114,405	133,470
Common equities and mutual funds	0	0
Non-marketable equity securities	10,500	6,500
Loans held for sale	13,610	148,777
Loans and leases receivable	0	0
Federal Home Loan Bank stock	29,944	30,916
Accrued interest receivable	0	0
Financial liabilities [Abstract]
Deposits	603,207	1,417,994
Overnight federal funds purchased	0	0
Federal Home Loan Bank advances	112,122	110,691
Other short- and long-term borrowings	100,826	113,876
Accrued interest payable	0	0
Level 3
Financial assets [Abstract]
Cash and cash equivalents	0	0
Debt securities available for sale	0	0
Debt securities held to maturity	0	0
Common equities and mutual funds	0	0
Non-marketable equity securities	0	0
Loans held for sale	0	0
Loans and leases receivable	3,606,603	3,622,597
Federal Home Loan Bank stock	0	0
Accrued interest receivable	0	0
Financial liabilities [Abstract]
Deposits	0	0
Overnight federal funds purchased	0	0
Federal Home Loan Bank advances	0	0
Other short- and long-term borrowings	0	0
Accrued interest payable	0	0
Carrying Amount
Financial assets [Abstract]
Cash and cash equivalents	108,733	126,545
Debt securities available for sale	1,195,619	1,272,493
Debt securities held to maturity	114,857	134,764
Common equities and mutual funds	2,899	2,606
Non-marketable equity securities	13,032	8,169
Loans held for sale	13,610	148,777
Loans and leases receivable	3,610,785	3,651,413
Federal Home Loan Bank stock	29,944	30,916
Accrued interest receivable	16,958	20,400
Financial liabilities [Abstract]
Deposits	3,962,404	4,337,005
Overnight federal funds purchased	717,000	642,000
Federal Home Loan Bank advances	110,000	110,000
Other short- and long-term borrowings	101,353	109,857
Accrued interest payable	3,607	9,414
Estimated Fair Value
Financial assets [Abstract]
Cash and cash equivalents	108,733	126,545
Debt securities available for sale	1,195,619	1,272,493
Debt securities held to maturity	114,405	133,470
Common equities and mutual funds	2,899	2,606
Non-marketable equity securities	13,032	8,169
Loans held for sale	13,610	148,777
Loans and leases receivable	3,606,603	3,622,597
Federal Home Loan Bank stock	29,944	30,916
Accrued interest receivable	16,958	20,400
Financial liabilities [Abstract]
Deposits	3,966,232	4,338,510
Overnight federal funds purchased	717,000	642,000
Federal Home Loan Bank advances	112,122	110,691
Other short- and long-term borrowings	100,826	113,876
Accrued interest payable	$ 3,607	$ 9,414

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