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INCOME TAXES - Narrative (Details) | 12 Months Ended
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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 |  |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(10)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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