Regulatory matters (Details) - USD ($)		12 Months Ended
	Jan. 01, 2016	Dec. 31, 2022	Dec. 31, 2021
Schedule of Capitalization
Capital stock (as a percent)		100.00%
Period over which the Company may only declare and pay dividends out of accumulated net earnings, including accumulated net earnings acquired as a result of a merger		7 years
Funds available for transfers		$ 36,700,000
Loans outstanding		$ 0	$ 0
Capital conservation buffer	2.50%
Maximum
Schedule of Capitalization
Net earnings which must set aside as a surplus (as a percent)		10.00%
Minimum
Schedule of Capitalization
Net earnings to surplus funds (as a percent)		10.00%