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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual Loans and Leases Additional Information (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) loan | Jun. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) loan
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans 90 days past due and still accruing | $ 0 |  |  | $ 0 |  | $ 728,000
Loans on non-accrual status | 45,621,000 |  |  | 45,621,000 |  | 35,900,000
Transfer from loans to other real estate owned, net |  |  |  | 3,253,000 | $ 1,116,000 |
Loans sold | 0 |  | $ 0 | 0 | 0 |
Net gain on sale of loans | 0 | $ 0 | 272,000 | 0 | 245,000 |
Single family residential mortgage |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Other real estate owned, net | 0 |  |  | 0 |  | 0
Transfer from loans to other real estate owned, net | 1,000 |  | 1,000 | 1,000 | 1,000 |
Loans sold | 3,300,000 |  | 1,100,000 | 3,300,000 | 1,100,000 |
Net gain on sale of loans | 365,000 |  | $ 38,000 | 365,000 | $ 38,000 |
Consumer | Single family residential mortgage |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans on non-accrual status | $ 16,544,000 |  |  | $ 16,544,000 |  | $ 13,519,000
Number of loans in process of foreclosure | loan | 1 |  |  | 1 |  | 0
Loans in process of foreclosure | $ 2,500,000 |  |  | $ 2,500,000 |  | $ 0
NTM Loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans on non-accrual status | 6,644,000 |  |  | 6,644,000 |  | 8,697,000
NTM Loans | Consumer | Single family residential mortgage |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans on non-accrual status | 6,644,000 |  |  | 6,644,000 |  | 8,697,000
NTM Loans | Green Loans | Non-performing Loans | Consumer |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans on non-accrual status | 3,300,000 |  |  | 3,300,000 |  | 4,000,000
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 | $ 3,300,000 |  |  | $ 3,300,000 |  | $ 4,700,000

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