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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Composition of Nonaccrual Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | $ 56,471 | $ 43,354
Non-accrual Loans with no ACL | 34,331 | 16,564
NTM Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 15,605 | 13,019
Traditional Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 40,866 | 30,335
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 23,638 | 19,114
Non-accrual Loans with no ACL | 5,364 | 337
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 2,763 | 0
Non-accrual Loans with no ACL | 2,763 | 0
Commercial | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 5,374 | 5,230
Non-accrual Loans with no ACL | 1,508 | 1,474
Commercial | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 0 | 0
Non-accrual Loans with no ACL | 0 | 0
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 | NTM Loans | Construction |  |
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 | 23,638 | 19,114
Commercial | Traditional Loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 2,763 | 0
Commercial | Traditional Loans | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 5,374 | 5,230
Commercial | Traditional Loans | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 0 | 0
Consumer | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 24,376 | 18,625
Non-accrual Loans with no ACL | 24,376 | 14,373
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 320 | 385
Non-accrual Loans with no ACL | 320 | 380
Consumer | NTM Loans | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 15,605 | 13,019
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 | 8,771 | 5,606
Consumer | Traditional Loans | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | $ 320 | $ 385

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