Borrowed Funds	3 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Borrowed Funds	BORROWED FUNDSFHLB Borrowings and Interest Rate Swaps - At December 31, 2021 and September 30, 2021, the Bank had entered into interest rate swap agreements with a total notional amount of $365.0 million in order to hedge the variable cash flows associated with $365.0 million of adjustable-rate FHLB advances. At December 31, 2021 and September 30, 2021, the interest rate swap agreements had an average remaining term to maturity of 3.8 years and 4.1 years, respectively. The interest rate swaps were designated as cash flow hedges and involved the receipt of variable amounts from a counterparty in exchange for the Bank making fixed-rate payments over the life of the interest rate swap agreements. At December 31, 2021 and September 30, 2021, the interest rate swaps were in a loss position with a total fair value of $22.5 million and $27.7 million, respectively, which was reported in other liabilities on the consolidated balance sheet. During the three months ended December 31, 2021 and December 31, 2020, $1.8 million and $3.0 million, respectively, was reclassified from AOCI as an increase to interest expense. At December 31, 2021, the Company estimated that $8.0 million of interest expense associated with the interest rate swaps would be reclassified from AOCI as an increase to interest expense on FHLB borrowings during the next 12 months. The Bank has minimum collateral posting thresholds with its derivative counterparties and posts collateral on a daily basis. The Bank posted cash collateral of $23.1 million at December 31, 2021 and $28.0 million at September 30, 2021.