Low-Income Housing Tax Credits (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019 USD ($) Fund	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) Fund	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) Fund
Low-Income Housing Tax Credits [Abstract]
Number of housing equity funds | Fund		4		4		4
Low-income housing investment		$ 3,100		$ 3,100		$ 3,200
Expected affordable housing tax credits				441
Additional committed capital calls expected		50		50		$ 248
Tax credits and other tax benefits [Abstract]
Amortization of operating losses		45	$ 80	125	$ 160
Tax benefit of operating losses	[1]	9	17	26	34
Tax credits		105	124	229	247
Total tax benefits		$ 114	$ 141	$ 255	$ 281
Effective income tax rate				21.00%

[1] Computed using a 21% tax rate.