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Regulatory Matters (Tables)
 12 Months Ended
Sep. 30, 2023
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations The following tables compare the Bank’s actual capital amounts at September 30, 2023 and 2022 to its minimum regulatory capital requirements and "Well Capitalized" regulatory capital at those dates (dollars in thousands):
ActualRegulatory Minimum To Be "Adequately Capitalized"Regulatory Minimum To Be "Well Capitalized" Under Prompt Corrective Action Provisions
September 30, 2023AmountRatioAmountRatioAmountRatio
Leverage Capital Ratio:
Tier 1 capital$218,749 12.0 %$72,983 4.0 %$91,229 5.0 %
Risk-based Capital Ratios:
CET1218,749 18.0 54,549 4.5 78,792 6.5 
Tier 1 capital218,749 18.0 72,731 6.0 96,975 8.0 
Total capital233,914 19.3 96,975 8.0 121,219 10.0 
September 30, 2022
Leverage Capital Ratio:
Tier 1 capital$202,438 10.9 %$74,039 4.0 %$92,549 5.0 %
Risk-based Capital Ratios:
CET1202,438 18.0 50,551 4.5 73,018 6.5 
Tier 1 capital202,438 18.0 67,402 6.0 89,869 8.0 
Total capital216,446 19.3 89,869 8.0 112,336 10.0 
The following table presents for informational purposes the regulatory capital ratios for Timberland Bancorp at September 30, 2023 and 2022 assuming that Timberland Bancorp was subject to regulatory guidelines for bank holding companies with $3.0 billion or more in assets (dollars in thousands):
20232022
AmountRatioAmountRatio
Leverage Capital Ratio:
Tier 1 capital$219,851 12.1 %$204,659 11.0 %
Risk-based Capital Ratios:
CET1219,851 18.1 204,659 18.2 
Tier 1 capital219,851 18.1 204,659 18.2 
Total capital235,023 19.4 218,667 19.5