Nature of Business and Its Significant Accounting Policies - Loans Held for Sale (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Loans held for sale
Provisions for credit losses	$ 419	$ (30)	$ 803	$ 2,568	$ 2,323
Johnson Mortgage Company LLC | Real Estate
Loans held for sale
Receivable settlement period on mortgage loans sold			30 days
Allowance for repurchase of loans sold	$ 0		$ 0		0
Provisions for credit losses			$ 0		$ 0
Johnson Mortgage Company LLC | Real Estate | Minimum
Loans held for sale
Number of family residences in structures for which mortgages are purchased or refinanced | item			1
Johnson Mortgage Company LLC | Real Estate | Maximum
Loans held for sale
Number of family residences in structures for which mortgages are purchased or refinanced | item			4