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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets        
Cash and cash equivalents $ 36,737 $ 1,334 $ 7,141 $ 214
Income taxes receivable and other receivables 103 5,685    
Total current assets 157,115 122,456    
Deferred taxes and other assets 10,597 7,702    
Total Assets 1,791,603 1,641,331    
Liabilities and Capitalization        
Notes payable to bank 0 5,000    
Income taxes payable 6,783 95    
Other Liabilities, Current 10,437 10,341    
Total current liabilities 118,572 115,998    
Notes payable to banks 134,200 200,000    
Total other credits 591,010 642,807    
Common shareholders' equity 641,673 601,530 $ 558,223 529,945
Total capitalization 1,082,021 882,526    
Liabilities and Equity, Total $ 1,791,603 $ 1,641,331    
Dividends Declared Per Common Share (in dollars per share) $ 1.28 $ 1.16 $ 1.06  
Income tax expense $ 28,197 $ 24,670 $ 18,017  
Parent Company        
Assets        
Cash and cash equivalents 441 310 $ 34 $ 48
Income Taxes Receivable 72 0    
Inter-company loan receivables 32,819 185,094    
Total current assets 33,332 185,404    
Investments in subsidiaries 716,627 616,725    
Deferred taxes and other assets 9,757 9,548    
Total Assets 759,716 811,677    
Liabilities and Capitalization        
Notes payable to bank 0 5,000    
Income taxes payable 2,123 3,259    
Other Liabilities, Current 272 274    
Total current liabilities 2,395 8,533    
Notes payable to banks 114,000 200,000    
Income taxes payable and other liabilities 1,648 1,614    
Total other credits 115,648 201,614    
Common shareholders' equity 641,673 601,530    
Total capitalization 641,673 601,530    
Liabilities and Equity, Total $ 759,716 $ 811,677    
Dividends Declared Per Common Share (in dollars per share) $ 1.280 $ 1.160 $ 1.060  
Income tax expense $ (208) $ (709) $ (525)