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Regulatory Capital and Supervision (Details)
$ in Thousands
24 Months Ended
Dec. 31, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
Total Risk-Based Capital    
Number of conditions or events that have changed the institution's category under capital guidelines | item 0  
Territorial Savings Bank    
Regulatory capital and supervision    
Minimum capital conservation buffer 0.0250  
Tier 1 Leverage Capital    
Required Ratio 0.0500 0.0500
Actual Amount $ 238,972 $ 235,408
Actual Ratio 0.1087 0.1109
Common Equity Tier 1 Risk-Based Capital    
Required Ratio 9.00% 9.00%
Actual Amount $ 238,972 $ 235,408
Actual Ratio 26.31% 25.98%
Tier 1 Risk-Based Capital    
Required Ratio 0.1050 0.1050
Actual Amount $ 238,972 $ 235,408
Actual Ratio 0.2598 0.2647
Total Risk-Based Capital    
Required Ratio 0.1250 0.1250
Actual Amount $ 244,093 $ 237,488
Actual Ratio 0.2620 0.2678
Territorial Bancorp Inc.    
Regulatory capital and supervision    
Threshold of assets requiring consolidated regulatory capital requirements identical to those applicable to subsidiary depository institutions $ 3,000,000  
Tier 1 Leverage Capital    
Actual Amount $ 257,307 $ 264,295
Actual Ratio 0.1221 0.1231
Common Equity Tier 1 Risk-Based Capital    
Actual Amount $ 257,307 $ 264,295
Actual Ratio 28.33% 29.16%
Tier 1 Risk-Based Capital    
Actual Amount $ 257,307 $ 264,295
Actual Ratio 0.2916 0.2940
Total Risk-Based Capital    
Actual Amount $ 262,428 $ 266,375
Actual Ratio 0.2939 0.2970