Capital - Repurchases of common stock - subnote (Details) - shares	Dec. 31, 2021	Oct. 01, 2021	Sep. 30, 2021
Equity [Abstract]
Shares tendered not withdrawn	653,098		846,743
Share repurchase program, excess shares purchased on pro rata basis	207,652	2,332	207,646
Share repurchase program, number of shares purchased percent	31.80%		24.50%