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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual Loans and Leases Additional Information (Details) $ in Thousands | Mar. 31, 2021 USD ($) Loan | Dec. 31, 2020 USD ($) Loan
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans 90 days past due and still accruing | $ 0 | $ 728
Loans on non-accrual status | 55,920 | 35,900
Consumer | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Loans on non-accrual status | $ 32,432 | $ 13,519
Number of loans in process of foreclosure | Loan | 1,000 | 0
Loans in process of foreclosure | $ 3,300 |
NTM Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans on non-accrual status | 11,652 | $ 8,697
NTM Loans | Consumer | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Loans on non-accrual status | 11,652 | 8,697
NTM Loans | Green Loans | Non-performing loans | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans on non-accrual status | 4,500 | 4,000
Green Loans (HELOC) - first liens | NTM Loans | Interest Only Loans | Non-performing loans | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans on non-accrual status | $ 7,100 | $ 4,700

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