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LOANS HELD FOR INVESTMENT, NET - Loan Categories (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Feb. 01, 2021 | Dec. 31, 2020
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LOANS HELD FOR INVESTMENT, NET |  |  |
Total Loans | $ 10,506,098 |  | $ 5,622,044
Allowance for loan losses | (98,200) |  | (41,461)
Total loans held for investment, net | 10,407,898 |  | 5,580,583
Loans acquired on merger | 4,530,000 | $ 4,531,640 |
Small Business Administration ("SBA") Paycheck Protection Program ("PPP") |  |  |
LOANS HELD FOR INVESTMENT, NET |  |  |
Total Loans | 1,430,000 |  |
Allowance for loan losses | $ 0 |  |
Loan and leases carry guarantee rate | 100.00% |  |
Paycheck Protection Program | Small Business Administration ("SBA") Paycheck Protection Program ("PPP") |  |  |
LOANS HELD FOR INVESTMENT, NET |  |  |
Total Loans |  |  | 321,900
Real estate |  |  |
LOANS HELD FOR INVESTMENT, NET |  |  |
Total Loans | $ 8,149,079 |  | 4,978,195
Real estate | One-to-four family residential and cooperative/condominium apartment |  |  |
LOANS HELD FOR INVESTMENT, NET |  |  |
Total Loans | 696,415 |  | 184,989
Real estate | Multifamily residential and residential mixed-use |  |  |
LOANS HELD FOR INVESTMENT, NET |  |  |
Total Loans | 3,567,207 |  | 2,758,743
Real estate | Commercial real estate ("CRE") |  |  |
LOANS HELD FOR INVESTMENT, NET |  |  |
Total Loans | 3,631,287 |  | 1,878,167
Real estate | Acquisition, development, and construction ("ADC") |  |  |
LOANS HELD FOR INVESTMENT, NET |  |  |
Total Loans | 254,170 |  | 156,296
Commercial and industrial ("C&I") |  |  |
LOANS HELD FOR INVESTMENT, NET |  |  |
Total Loans | 2,332,610 |  | 641,533
Commercial and industrial ("C&I"), including SBA and PPP loans |  |  |
LOANS HELD FOR INVESTMENT, NET |  |  |
Total Loans | 2,332,610 |  | 641,533
Commercial and industrial ("C&I"), including SBA and PPP loans | Small Business Administration ("SBA") Paycheck Protection Program ("PPP") |  |  |
LOANS HELD FOR INVESTMENT, NET |  |  |
Total Loans | 2,332,610 |  |
Other loans |  |  |
LOANS HELD FOR INVESTMENT, NET |  |  |
Total Loans | $ 24,409 |  | $ 2,316

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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