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Commitment and Contingencies	3 Months Ended
Commitment and Contingencies	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Commitments - The Company’s lease commitments consist primarily of real estate property for branches and office space under various non-cancellable operating leases that expire between 2021 and 2070. The majority of the leases contain renewal options and provisions for increases in rental rates based on a predetermined schedule or an agreed upon index. Financial Instruments with Off-Balance Sheet Risk - The only material off-balance-sheet credit exposures are loans in process and unused lines of credit, which had a combined balance of $3,011,286,000 and $2,738,095,000 at December 31, 2020 and September 30, 2020, respectively. The reserve was $26,500,000 as of December 31, 2020, which is an increase from $25,000,000 at September 30, 2020. See Note A "Summary of Significant Accounting Policies" for details regarding the reserve methodology. Legal Proceedings - The Company and its subsidiaries are from time to time defendants in and are threatened with various legal proceedings arising from regular business activities. Management, after consulting with legal counsel, is of the opinion that the ultimate liability, if any, resulting from these pending or threatened actions and proceedings will not have a material effect on the financial statements of the Company.