Low-Income Housing Tax Credits (Details) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2021 USD ($) Fund	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) Fund
Low-Income Housing Tax Credits [Abstract]
Number of housing equity funds | Fund		4		4
Low-income housing investment		$ 2,200		$ 2,300
Expected affordable housing tax credits				361
Additional committed capital calls expected		18		$ 18
Tax credits and other benefits [Abstract]
Amortization of operating losses		49	$ 45
Tax benefit of operating losses	[1]	10	9
Tax credits		94	103
Total tax benefits		$ 104	$ 112
Effective income tax rate		21.00%

[1] Computed using a 21% tax rate.