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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Composition of Nonaccrual Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | $ 45,621 | $ 35,900
Nonaccrual Loans with no ACL | 35,472 | 32,066
NTM Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 6,644 | 8,697
Traditional Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 38,977 | 27,203
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 11,834 | 13,821
Nonaccrual Loans with no ACL | 11,834 | 13,088
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 4,419 | 4,654
Nonaccrual Loans with no ACL | 4,419 | 4,654
Commercial | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 12,824 | 3,749
Nonaccrual Loans with no ACL | 5,204 | 648
Commercial | NTM Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 0 | 0
Commercial | NTM Loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 0 | 0
Commercial | NTM Loans | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 0 | 0
Commercial | Traditional Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 11,834 | 13,821
Commercial | Traditional Loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 4,419 | 4,654
Commercial | Traditional Loans | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 12,824 | 3,749
Consumer | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 16,544 | 13,519
Nonaccrual Loans with no ACL | 14,015 | 13,519
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 0 | 157
Nonaccrual Loans with no ACL | 0 | 157
Consumer | NTM Loans | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 6,644 | 8,697
Consumer | NTM Loans | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 0 | 0
Consumer | Traditional Loans | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 9,900 | 4,822
Consumer | Traditional Loans | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | $ 0 | $ 157

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