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Regulatory Matters: Narrative (Details) - Timberland Bank	Sep. 30, 2020	Sep. 30, 2019
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Tier 1 Risk-based Capital Ratio, Regulatory Minimum To Be Adequately Capitalized, Ratio	4.50%	4.50%
Tier 1 Risk-based Capital, Regulatory Minimum To Be Adequately Capitalized, Ratio	6.00%	6.00%
Total Capital, Regulatory Minimum To Be Adequately Capitalized, Ratio	8.00%	8.00%
Tier 1 Leverage Capital, Regulatory Minimum To Be Adequately Capitalized, Ratio	4.00%	4.00%

X

- Definition

Tier One Risk Adjusted Capital Required For Capital Adequacy To Risk Weighted Assets

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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