Federal Reserve Bank Stock (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Federal Reserve Bank Stock
Capital stock of the Federal Reserve Bank owned	$ 3,180	$ 3,170
Territorial Savings Bank
Federal Reserve Bank Stock
Capital stock of the Federal Reserve Bank owned	$ 3,200
FRB of San Francisco
Federal Reserve Bank Stock
Requirement to hold shares of capital stock of the Federal Reserve Bank as a percentage of capital and surplus (as a percent)	6.00%