Off-Balance Sheet Financial Instruments and Gurantees (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Loss Contingencies [Line Items]
Financial instrument commitments	$ 119,347	$ 133,659
Commitments to grant loans [Member]
Loss Contingencies [Line Items]
Financial instrument commitments	49,806	51,225
Unfunded commitments under lines of credit [Member]
Loss Contingencies [Line Items]
Financial instrument commitments	65,854	78,024
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Financial instrument commitments	$ 3,687	$ 4,410