Low-Income Housing Tax Credits (Details) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2021 USD ($) Fund	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Fund	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) Fund
Low-Income Housing Tax Credits [Abstract]
Number of housing equity funds | Fund		4		4		4
Low-income housing investment		$ 2,100		$ 2,100		$ 2,300
Expected affordable housing tax credits						361
Additional committed capital calls expected		0		0		$ 18
Tax credits and other benefits [Abstract]
Amortization of operating losses		51	$ 45	151	$ 136
Tax benefit of operating losses	[1]	11	10	32	29
Tax credits		89	105	272	314
Total tax benefits		$ 100	$ 115	$ 304	$ 343
Effective income tax rate				21.00%

[1] Computed using a 21% tax rate.