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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Composition of Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | $ 35,900 | $ 43,354
Nonaccrual Loans with no ACL | 32,066 | 16,564
NTM Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 8,697 | 13,019
Traditional Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 27,203 | 30,335
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 13,821 | 19,114
Nonaccrual Loans with no ACL | 13,088 | 337
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 4,654 | 0
Nonaccrual Loans with no ACL | 4,654 | 0
Commercial | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 3,749 | 5,230
Nonaccrual Loans with no ACL | 648 | 1,474
Commercial | NTM Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 0 | 0
Commercial | NTM Loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 0 | 0
Commercial | NTM Loans | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 0 | 0
Commercial | Traditional Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 13,821 | 19,114
Commercial | Traditional Loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 4,654 | 0
Commercial | Traditional Loans | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 3,749 | 5,230
Consumer | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 13,519 | 18,625
Nonaccrual Loans with no ACL | 13,519 | 14,373
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 157 | 385
Nonaccrual Loans with no ACL | 157 | 380
Consumer | NTM Loans | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 8,697 | 13,019
Consumer | NTM Loans | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 0 | 0
Consumer | Traditional Loans | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | 4,822 | 5,606
Consumer | Traditional Loans | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Nonaccrual Loans | $ 157 | $ 385

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