XML 93 R77.htm IDEA: XBRL DOCUMENT v3.20.4
Leases - Additional information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating leases right of use assets $ 4,449,000    
Short-term lease liabilities 1,629,000 $ 1,520,000  
Long-term lease liabilities 2,968,000 2,855,000  
Short-term lease cost $ 1,943,000 1,870,000  
Weighted-average remaining lease term 3 years 4 months 24 days    
Weighted-average discount rate 3.00%    
Additional interest factor 1.375%    
Lease liabilities paid $ 1,930,000 1,857,000  
ROU assets in exchange for new operating lease liabilities 2,029,000 1,761,000  
Lease income 792,000 792,000 $ 792,000
Operating lease liability additions $ 1,935,000 $ 1,758,000