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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Financial assets |  |
Debt securities available for sale | $ 1,228,124 | $ 1,268,102
Fair Value | 82,927 | 93,745
Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 1,586,451 | 427,367
Debt securities available for sale | 0 | 0
Fair Value | 0 | 0
Common equities and mutual funds | 3,148 | 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 | 17,133 | 16,628
Financial liabilities |  |
Deposits | 6,040,903 | 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 | 2,068 | 1,923
Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Debt securities available for sale | 1,228,124 | 1,268,102
Fair Value | 82,927 | 93,745
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 13,750 | 12,000
Loans held for sale | 133,659 | 183,577
Loans and leases receivable | 0 | 0
Federal Reserve Bank and Federal Home Loan Bank stocks | 27,138 |
Federal Reserve Bank and Federal Home Loan Bank stocks |  | 27,138
Accrued interest receivable | 0 | 0
Financial liabilities |  |
Deposits | 167,265 | 275,045
Overnight federal funds purchased |  | 0
Federal Home Loan Bank advances |  | 0
Other short- and long-term borrowings | 98,873 | 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 | 3,426,720 | 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 | 1,586,451 | 427,367
Debt securities available for sale | 1,228,124 | 1,268,102
Fair Value | 81,328 | 92,610
Common equities and mutual funds | 3,148 | 2,969
Non-marketable equity securities | 17,646 | 14,784
Loans held for sale | 133,659 | 183,577
Loans and leases receivable | 3,439,564 | 3,314,140
Federal Reserve Bank and Federal Home Loan Bank stocks | 27,138 |
Federal Reserve Bank and Federal Home Loan Bank stocks |  | 27,138
Accrued interest receivable | 17,133 | 16,628
Financial liabilities |  |
Deposits | 6,207,791 | 4,979,200
Overnight federal funds purchased |  | 0
Federal Home Loan Bank advances |  | 0
Other short- and long-term borrowings | 96,760 | 98,224
Accrued interest payable | 2,068 | 1,923
Estimated Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 1,586,451 | 427,367
Debt securities available for sale | 1,228,124 | 1,268,102
Fair Value | 82,927 | 93,745
Common equities and mutual funds | 3,148 | 2,969
Non-marketable equity securities | 17,646 | 14,784
Loans held for sale | 133,659 | 183,577
Loans and leases receivable | 3,426,720 | 3,307,037
Federal Reserve Bank and Federal Home Loan Bank stocks | 27,138 |
Federal Reserve Bank and Federal Home Loan Bank stocks |  | 27,138
Accrued interest receivable | 17,133 | 16,628
Financial liabilities |  |
Deposits | 6,208,167 | 4,980,073
Overnight federal funds purchased |  | 0
Federal Home Loan Bank advances |  | 0
Other short- and long-term borrowings | 98,873 | 100,185
Accrued interest payable | $ 2,068 | $ 1,923

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