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Benefit Plans - Schedule of Changes in Plan Benefit Obligation and Fair Value of Assets (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Change in Benefit Obligation    
Benefit obligation, beginning of year $ 5,777,000 $ 8,107,000
Service cost 0 410,000
Interest cost 82,000 331,000
Actuarial (gain) loss (145,000) 245,000
Benefits paid (431,000) (695,000)
Gain due to curtailment 0 (2,621,000)
Benefit obligation, end of year 5,283,000 5,777,000
Changes in Plan Assets    
Fair value of plan assets, beginning of year 3,693,000 4,264,000
Actual return on plan assets 16,000 124,000
Employer contributions 1,800,000 0
Benefits paid (431,000) (695,000)
Fair value of assets, end of year 5,078,000 3,693,000
Funded Status, end of year (205,000) (2,084,000)
Amount Recognized in Other Liabilities $ (205,000) $ (2,084,000)