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LOANS AND ALLOWANCE FOR LOAN LOSSES - Composition of Nonaccrual Loans and Leases (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | $ 45,169 | $ 21,585
NTM Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 1,110 | 0
Traditional Loans and Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 44,059 | 21,585
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 20,762 | 5,455
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 0 | 0
Commercial | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 5,773 | 2,574
Commercial | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 2,519 | 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 and Leases | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 20,762 | 5,455
Commercial | Traditional Loans and Leases | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 0 | 0
Commercial | Traditional Loans and Leases | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 5,773 | 2,574
Commercial | Traditional Loans and Leases | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 2,519 | 0
Consumer | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 15,587 | 12,929
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 528 | 627
Consumer | NTM Loans | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 1,110 | 0
Consumer | NTM Loans | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 0 | 0
Consumer | Traditional Loans and Leases | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | 14,477 | 12,929
Consumer | Traditional Loans and Leases | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total non-accrual loans | $ 528 | $ 627

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