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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | ---
Financial assets |  |
Debt securities available for sale | $ 1,480,780 | $ 1,268,102
Fair Value | 73,294 | 93,745
Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 3,724,242 | 427,367
Debt securities available for sale | 0 | 0
Fair Value | 0 | 0
Common equities and mutual funds | 3,235 | 2,969
Non-marketable equity securities | 0 | 0
Loans held for sale | 0 | 0
Loans and leases receivable | 0 | 0
Federal Reserve Bank and Federal Home Loan Bank stocks | 0 |
Federal Reserve Bank and Federal Home Loan Bank stocks |  | 0
Accrued interest receivable | 17,429 | 16,628
Financial liabilities |  |
Deposits | 8,600,335 | 4,705,028
Overnight federal funds purchased |  | 0
Federal Home Loan Bank advances |  | 0
Other short- and long-term borrowings | 0 | 0
Accrued interest payable | 679 | 1,923
Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Debt securities available for sale | 1,480,780 | 1,268,102
Fair Value | 73,294 | 93,745
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 13,750 | 12,000
Loans held for sale | 67,635 | 183,577
Loans and leases receivable | 0 | 0
Federal Reserve Bank and Federal Home Loan Bank stocks | 28,433 |
Federal Reserve Bank and Federal Home Loan Bank stocks |  | 27,138
Accrued interest receivable | 0 | 0
Financial liabilities |  |
Deposits | 42,225 | 275,045
Overnight federal funds purchased |  | 0
Federal Home Loan Bank advances |  | 0
Other short- and long-term borrowings | 97,259 | 100,185
Accrued interest payable | 0 | 0
Level 3 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Debt securities available for sale | 0 | 0
Fair Value | 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 | 3,655,832 | 3,307,037
Federal Reserve Bank and Federal Home Loan Bank stocks | 0 |
Federal Reserve Bank and Federal Home Loan Bank stocks |  | 0
Accrued interest receivable | 0 | 0
Financial liabilities |  |
Deposits | 0 | 0
Overnight federal funds purchased |  | 0
Federal Home Loan Bank advances |  | 0
Other short- and long-term borrowings | 0 | 0
Accrued interest payable | 0 | 0
Carrying Amount |  |
Financial assets |  |
Cash and cash equivalents | 3,724,242 | 427,367
Debt securities available for sale | 1,480,780 | 1,268,102
Fair Value | 72,112 | 92,610
Common equities and mutual funds | 3,235 | 2,969
Non-marketable equity securities | 18,015 | 14,784
Loans held for sale | 67,635 | 183,577
Loans and leases receivable | 3,648,028 | 3,314,140
Federal Reserve Bank and Federal Home Loan Bank stocks | 28,433 |
Federal Reserve Bank and Federal Home Loan Bank stocks |  | 27,138
Accrued interest receivable | 17,429 | 16,628
Financial liabilities |  |
Deposits | 8,642,413 | 4,979,200
Overnight federal funds purchased |  | 0
Federal Home Loan Bank advances |  | 0
Other short- and long-term borrowings | 95,336 | 98,224
Accrued interest payable | 679 | 1,923
Estimated Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 3,724,242 | 427,367
Debt securities available for sale | 1,480,780 | 1,268,102
Fair Value | 73,294 | 93,745
Common equities and mutual funds | 3,235 | 2,969
Non-marketable equity securities | 18,015 | 14,784
Loans held for sale | 67,635 | 183,577
Loans and leases receivable | 3,655,832 | 3,307,037
Federal Reserve Bank and Federal Home Loan Bank stocks | 28,433 |
Federal Reserve Bank and Federal Home Loan Bank stocks |  | 27,138
Accrued interest receivable | 17,429 | 16,628
Financial liabilities |  |
Deposits | 8,642,560 | 4,980,073
Overnight federal funds purchased |  | 0
Federal Home Loan Bank advances |  | 0
Other short- and long-term borrowings | 97,259 | 100,185
Accrued interest payable | $ 679 | $ 1,923

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