Low-Income Housing Tax Credits (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2019 USD ($) Fund	Dec. 31, 2018 USD ($) Fund	Dec. 31, 2017
Low-Income Housing Tax Credits [Abstract]
Number of housing equity funds | Fund		4	4
Low-income housing investment		$ 3,000	$ 3,200
Additional committed capital calls expected		50	248
Amortization expense		216	320
Tax credits and other benefits [Abstract]
Amortization of operating losses		216	320
Tax benefit of operating losses	[1]	45	67
Tax credits		441	496
Total tax benefit		$ 486	$ 563
Effective income tax rate		21.00%		35.00%

[1] Computed using a 21% tax rate.