Off-Balance Sheet Financial Instruments and Guarantees (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Loss Contingencies [Line Items]
Financial instrument commitments	$ 260,036	$ 235,689
Commitments to grant loans [Member]
Loss Contingencies [Line Items]
Financial instrument commitments	101,466	91,186
Unfunded commitments under lines of credit [Member]
Loss Contingencies [Line Items]
Financial instrument commitments	145,636	136,168
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Financial instrument commitments	$ 12,934	$ 8,335