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Condensed Financial Information of Parent Company - Summary of Condensed Balance Sheets (Detail) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets [Abstract]        
Short-term investments $ 14,030,222 $ 16,748,760    
Cash 49,318,930 52,594,461 $ 37,833,435 $ 24,587,214
Property and equipment 4,558,072 4,690,704    
Total assets 1,923,161,131 1,832,078,267    
Liabilities [Abstract]        
Cash dividends declared to stockholders 4,075,234 3,948,484    
Borrowings under lines of credit 35,000,000 60,000,000    
Other 7,524,095 1,863,363    
Total liabilities 1,472,145,612 1,433,208,366    
Stockholders' equity 451,015,519 398,869,901 448,696,104 438,615,320
Total liabilities and stockholders' equity 1,923,161,131 1,832,078,267    
Parent Company [Member]        
Assets [Abstract]        
Investment in subsidiaries/affiliates (equity method) 489,657,000 465,030,000    
Short-term investments 2,502,000 29,000    
Cash 2,350,000 1,542,000 $ 3,237,000 $ 1,820,000
Property and equipment 944,000 928,000    
Total assets 495,453,000 467,529,000    
Liabilities [Abstract]        
Cash dividends declared to stockholders 4,075,000 3,948,000    
Borrowings under lines of credit 35,000,000 60,000,000    
Other 5,362,000 4,711,000    
Total liabilities 44,437,000 68,659,000    
Stockholders' equity 451,016,000 398,870,000    
Total liabilities and stockholders' equity $ 495,453,000 $ 467,529,000