Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
examination
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Operating Loss Carryforwards [Line Items]      
Statutory federal income tax rate 21.00% 21.00% 21.00%
Effective tax rate 20.60% 17.60% 19.70%
Deferred tax assets, net $ 36,040,000 $ 25,917,000  
Deferred tax liabilities 4,476,000 4,449,000  
Unrecognized tax benefits 0 0  
Deferred tax assets, valuation allowance 0    
Effective tax rate reconciliation adjustment for deferred tax asset     $ 19,700,000
Favorable revaluation adjustment   (2,700,000)  
Tax benefit recognized for energy efficient homes credit 19,900,000 $ 8,100,000  
NOL carryforwards $ 0    
Internal Revenue Service (IRS) [Member]      
Operating Loss Carryforwards [Line Items]      
Number of income tax examinations pending | examination 0    
State [Member]      
Operating Loss Carryforwards [Line Items]      
Number of income tax examinations pending | examination 0    
Other Receivables [Member]      
Operating Loss Carryforwards [Line Items]      
Current tax receivable $ 700,000    
Accrued Liabilities [Member]      
Operating Loss Carryforwards [Line Items]      
Current tax payable $ 25,300,000