Income Taxes - Summary of the Sources of Differences Between Income Taxes At the Federal Statutory Rate and the Provision (Credit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal income taxes at statutory rate, Amount	$ (41)	$ (613)
State income taxes, net of federal income tax benefit, Amount	(34)	(118)
Increase in cash value of life insurance, Amount	(142)	(140)
Change in valuation allowance, Amount		(4,757)
Tax reform, Amount		2,062
Other, Amount	40	104
Total tax (benefit)	$ (177)	$ (3,462)
Reconciliation of statutory to effective rates: Percentage
Federal income taxes at statutory rate, Percentage	21.00%	34.00%
State income taxes, net of federal income tax benefit, Percentage	17.34%	6.54%
Increase in cash value of life insurance, Percentage	72.73%	7.76%
Change in valuation allowance, Percentage	0.00%	263.83%
Tax reform, Percentage	0.00%	(114.36%)
Other, Percentage	(20.41%)	(5.76%)
Provision (credit) for income taxes, Percentage	90.66%	192.01%