Advances from the Federal Home Loan Bank (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Federal Home Loan Bank advances
Federal Home Loan Bank stock, at cost	$ 12,192	$ 8,197
Federal Home Loan Bank, Advances, Rolling Maturity
Due within one year	82,000	24,000
Due over 1 year to 2 years	45,000	82,000
Due over 2 years to 3 years	20,000	25,000
Due over 3 years to 4 years	30,000	10,000
Due over 4 years to 5 years	60,000
Due over 5 years to 6 years	5,000
Total	$ 242,000	$ 141,000
Weighted Average Rate
Due within one year (as a percent)	1.40%	1.27%
Due over 1 year to 2 years (as a percent)	2.87%	1.40%
Due over 2 years to 3 years (as a percent)	3.20%	1.58%
Due over 3 years to 4 years (as a percent)	4.24%	1.97%
Due over 4 years to 5 years (as a percent)	4.32%
Due over 5 years to 6 years (as a percent)	4.38%
Total (as a percent)	2.96%	1.45%
FHLB Des Moines
Federal Home Loan Bank advances
Available additional unused FHLB advances	$ 612,600	$ 769,100
Territorial Savings Bank
Federal Home Loan Bank advances
Federal Home Loan Bank stock, at cost	$ 12,200,000	$ 8,200,000
Territorial Savings Bank | FHLB Des Moines
Federal Home Loan Bank advances
Percentage of total assets used to determine maximum line of credit	45.00%