Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Changes in Gross Carrying Amounts of Goodwill

The changes in gross carrying amounts of goodwill are as follows (in thousands):

	Goodwill
December 31, 2015	$	12,025
Goodwill adjustment		80
December 31, 2016		12,105
Goodwill acquired		—
December 31, 2017	$	12,105

Summary of Gross Amounts and Accumulated Amortization of Identifiable Intangible Assets

The gross amounts and accumulated amortization of identifiable intangible assets are as follows (in thousands):

	December 31, 2017				December 31, 2016
	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Amortizable intangible assets:
Customer relationships (useful life of 6-15 years)	$	19,000	$	8,502	$	19,000	$	7,439
Covenants not-to-compete (useful life of 4-6 years)		4,425		4,209		4,425		4,001
Trademarks (useful life of 15 years)		1,500		292		1,500		192
Total	$	24,925	$	13,003	$	24,925	$	11,632

Summary of Estimated Amortization Expense

Estimated amortization expense for the five succeeding years follows (in thousands):

	Amount
2018	$	1,363
2019		1,180
2020		1,163
2021		1,163
2022		1,008