Underwriting information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Gross Written Premiums by Underwriting Division

Gross written premiums by underwriting division are presented below:

	Year Ended December 31,
	2017		2016		2015
	(in thousands)
Commercial:
Construction	$	48,587	$	42,234	$	36,932
Small business	34,896		27,333		21,468
Energy	22,898		16,157		19,022
Excess casualty	20,260		17,799		16,194
General casualty	15,865		16,162		20,511
Product liability	14,288		10,140		9,480
Professional liability	12,956		14,212		14,636
Life sciences	12,408		10,897		11,935
Allied health	10,645		9,344		8,644
Health care	6,235		6,594		6,579
Commercial property	5,609		4,835		6,181
Management liability	4,123		2,244		420
Environmental	2,692		1,931		1,005
Public entity	1,265		875		—
Inland marine	967		910		195
Commercial insurance	816		459		—
Total commercial	214,510		182,126		173,202
Personal:
Personal insurance	8,681		6,352		3,807
Total personal	8,681		6,352		3,807
Total	$	223,191	$	188,478	$	177,009