Organization and Summary of Significant Accounting Policies - Premises and Equipment (Details)	Sep. 30, 2023
Software
Property, Plant and Equipment [Line Items]
Estimated lives (in years)	3 years
Minimum | Premises
Property, Plant and Equipment [Line Items]
Estimated lives (in years)	7 years
Minimum | Equipment
Property, Plant and Equipment [Line Items]
Estimated lives (in years)	3 years
Maximum | Premises
Property, Plant and Equipment [Line Items]
Estimated lives (in years)	40 years
Maximum | Equipment
Property, Plant and Equipment [Line Items]
Estimated lives (in years)	7 years