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Debt (Narrative) (Details) - USD ($)
5 Months Ended
May 03, 2016
Dec. 15, 2015
Mar. 31, 2018
Oct. 22, 2018
Sep. 30, 2018
Jul. 24, 2018
Apr. 26, 2018
Mar. 27, 2018
Dec. 31, 2017
Dec. 01, 2017
Oct. 27, 2017
Sep. 01, 2017
Mar. 06, 2017
Dec. 01, 2016
Nov. 30, 2016
Aug. 31, 2016
Jul. 30, 2015
Dec. 13, 2013
Debt Instrument [Line Items]                                    
Costs associated with amendment         $ 1,035,000       $ 1,227,000                  
Notes payable         1,045,000       9,926,000                  
Notes Payable                                    
Debt Instrument [Line Items]                                    
Notes payable         1,045,000       9,926,000                  
Briar Ridge Investments, LTD | Notes Payable                                    
Debt Instrument [Line Items]                                    
Notes payable         0       9,000,000                  
Briar Ridge Investments, LTD | Subsidiary | Notes Payable                                    
Debt Instrument [Line Items]                                    
Stated interest rate                                   6.00%
Face amount                                   $ 9,000,000
Graham Mortgage Corporation | Notes Payable                                    
Debt Instrument [Line Items]                                    
Notes payable         895,000       926,000                  
Graham Mortgage Corporation | Subsidiary | Notes Payable                                    
Debt Instrument [Line Items]                                    
Stated interest rate                             3.00%      
Accrued interest         100,000                          
Notes payable                             $ 1,200,000.0      
Bower Hills, LLC | Notes Payable                                    
Debt Instrument [Line Items]                                    
Notes payable         $ 150,000       $ 0                  
Bower Hills, LLC | Subsidiary | Notes Payable                                    
Debt Instrument [Line Items]                                    
Notes payable             $ 300,000                      
Inwood National Bank | Johns Creek Carrollton Allen                                    
Debt Instrument [Line Items]                                    
Maximum borrowing capacity                                 $ 50,000,000.0  
Interest rate at period end         5.25%                          
Borrowing base limitation, total value of land 50.00%                                  
Borrowing base limitation, total value of lots owned by certain of the Company's subsidiaries 65.00%                                  
Maximum value of land used when calculating borrowing base 65.00%                                  
Commitment fee percentage on amount of unused commitments 0.25%                                  
Inwood National Bank | Johns Creek Carrollton Allen | Minimum                                    
Debt Instrument [Line Items]                                    
Stated interest rate                                 4.00%  
Inwood National Bank | Johns Creek Carrollton Allen | Maximum                                    
Debt Instrument [Line Items]                                    
Stated interest rate                                 18.00%  
Inwood National Bank | Johns Creek Carrollton Allen | Subsidiary                                    
Debt Instrument [Line Items]                                    
Maximum borrowing capacity                     $ 75,000,000.0           $ 50,000,000.0  
Maximum loan-to-value ratio during temporary borrowing base waiver     70.00%                              
Inwood National Bank | Johns Creek Carrollton Allen | Other Assets                                    
Debt Instrument [Line Items]                                    
Costs associated with amendment $ 100,000                                  
Citibank, N.A. and Credit Suisse AG, Cayman Islands Branch | Unsecured revolving credit facility | Unsecured Debt                                    
Debt Instrument [Line Items]                                    
Maximum borrowing capacity   $ 75,000,000.0                                
Commitment fee percentage on amount of unused commitments   0.45%                                
Borrowings on lines of credit   $ 40,000,000                                
Unrestricted cash on borrowing base limitation   100.00%                                
Borrowing base limitation for unrestricted cash   $ 15,000,000.0                                
Percentage book value of model homes, construction in progress homes, completed sold homes and completed speculative homes   85.00%                                
Percentage book value of finished lots and land under development   65.00%                                
Percentage book value of entitled land   50.00%                                
Citibank, N.A. and Credit Suisse AG, Cayman Islands Branch | Unsecured revolving credit facility | Unsecured Debt | Minimum                                    
Debt Instrument [Line Items]                                    
Interest rate at period end         4.56%                          
Citibank, N.A. and Credit Suisse AG, Cayman Islands Branch | Unsecured revolving credit facility | Unsecured Debt | Maximum                                    
Debt Instrument [Line Items]                                    
Interest rate at period end         4.58%                          
Citibank, N.A. and Credit Suisse AG, Cayman Islands Branch | Unsecured Revolving Credit Facility, Base Rate Advances | Unsecured Debt | Federal Funds Effective Swap Rate                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate   0.50%                                
Citibank, N.A. and Credit Suisse AG, Cayman Islands Branch | Unsecured Revolving Credit Facility, Base Rate Advances | Unsecured Debt | London Interbank Offered Rate (LIBOR)                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate   1.00%                                
Citibank, N.A. and Credit Suisse AG, Cayman Islands Branch | Unsecured Revolving Credit Facility, Base Rate Advances | Unsecured Debt | Base Rate                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate   1.50%                                
Citibank, N.A. and Credit Suisse AG, Cayman Islands Branch | Unsecured Revolving Credit Facility, Eurodollar Rate Advances | Unsecured Debt | London Interbank Offered Rate (LIBOR)                                    
Debt Instrument [Line Items]                                    
Basis spread on variable rate   2.50%                                
Citibank, N.A. | Unsecured revolving credit facility | Unsecured Debt                                    
Debt Instrument [Line Items]                                    
Costs associated with amendment           $ 100,000                        
Borrowings on lines of credit   $ 25,000,000                       $ 35,000,000        
Increase in commitment           5,000,000.0                        
Credit Suisse AG, Cayman Islands Branch | Unsecured revolving credit facility | Unsecured Debt                                    
Debt Instrument [Line Items]                                    
Borrowings on lines of credit   $ 15,000,000                   $ 25,000,000            
Increase in commitment           5,000,000.0                        
Flagstar Bank | Unsecured revolving credit facility | Unsecured Debt                                    
Debt Instrument [Line Items]                                    
Borrowings on lines of credit                       70,000,000 $ 35,000,000     $ 20,000,000    
Flagstar Bank | Unsecured revolving credit facility | Other Assets | Unsecured Debt                                    
Debt Instrument [Line Items]                                    
Costs associated with amendment                         100,000          
Citibank, N.A., Credit Suisse AG, Cayman Islands Branch, and Flagstar Bank | Unsecured revolving credit facility | Unsecured Debt                                    
Debt Instrument [Line Items]                                    
Maximum borrowing capacity                       200,000,000.0       110,000,000.0    
Borrowings on lines of credit                       130,000,000 $ 85,000,000 $ 70,000,000   $ 60,000,000    
Upfront fee, percent of aggregate amount of extended commitments                   0.15%       0.15%        
Citibank, N.A., Credit Suisse AG, Cayman Islands Branch, and Flagstar Bank | Unsecured revolving credit facility | Other Assets | Unsecured Debt                                    
Debt Instrument [Line Items]                                    
Costs associated with amendment                       $ 400,000            
JPMorgan Chase Bank , N.A. | Unsecured revolving credit facility | Unsecured Debt                                    
Debt Instrument [Line Items]                                    
Borrowings on lines of credit               $ 30,000,000                    
Increase in commitment           5,000,000.0                        
Citibank, N.A., Credit Suisse AG, Cayman Islands Branch, Flagstar Bank and JP Morgan Chase | Unsecured revolving credit facility | Unsecured Debt                                    
Debt Instrument [Line Items]                                    
Borrowings on lines of credit               160,000,000                    
Citibank, N.A., Credit Suisse AG, Cayman Islands Branch, Flagstar Bank and JP Morgan Chase | Unsecured revolving credit facility | Unsecured Debt | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Borrowings on lines of credit       $ 175,000,000                            
Citibank, N.A., Credit Suisse AG, Cayman Islands Branch, Flagstar Bank and JP Morgan Chase | Unsecured revolving credit facility | Other Assets | Unsecured Debt                                    
Debt Instrument [Line Items]                                    
Costs associated with amendment               200,000                    
Citibank, N.A., Credit Suisse AG, Cayman Islands Branch, and JPMorgan Chase | Unsecured revolving credit facility | Unsecured Debt                                    
Debt Instrument [Line Items]                                    
Increase in commitment           $ 15,000,000.0                        
Chemical Financial Corporation [Member] | Unsecured revolving credit facility | Unsecured Debt                                    
Debt Instrument [Line Items]                                    
Borrowings on lines of credit               $ 25,000,000                    
Chemical Financial Corporation [Member] | Unsecured revolving credit facility | Unsecured Debt | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Borrowings on lines of credit       $ 200,000,000