Low-Income Housing Tax Credits (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2019 USD ($) Fund	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) Fund
Low-Income Housing Tax Credits [Abstract]
Number of housing equity funds | Fund		4		4
Low-income housing investment		$ 3,100		$ 3,200
Expected affordable housing tax credits		440
Additional committed capital calls expected		140		$ 248
Tax credits and other tax benefits [Abstract]
Amortization of operating losses		80	$ 80
Tax benefit of operating losses	[1]	17	17
Tax credits		124	124
Total tax benefits		141	141
Impairment loss on investments		$ 0	$ 0
Effective income tax rate		21.00%

[1] Computed using a 21% tax rate.