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LOANS, ALLOWANCE FOR LOAN LOSSES AND IMPAIRED LOANS - SBA PPP Loans by Round (Details) - USD ($) $ in Thousands | Apr. 30, 2021 | Apr. 01, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Gross loans |  |  | $ 1,201,262 | $ 1,246,889 | $ 1,189,425
SBA PPP loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Gross loans |  |  | 118,931 | 123,702 |
Net Deferred Fee Income |  |  | 3,000 | 3,000 |
SBA PPP loans | Subsequent Event |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Gross loans | $ 127,000 | $ 119,000 |  |  |
Net Deferred Fee Income | 4,700 | 3,900 |  |  |
SBA PPP loans | SBA PPP Loans - Round 1 |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Gross loans |  |  | 72,000 | 124,000 |
Net Deferred Fee Income |  |  | 1,300 | 3,000 |
SBA PPP loans | SBA PPP Loans - Round 1 | Subsequent Event |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Net Deferred Fee Income |  | $ 900 |  |  |
SBA PPP loans | SBA PPP Loans - Round 2 |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Gross loans |  |  | 47,000 | 0 |
Net Deferred Fee Income |  |  | $ 1,700 | $ 0 |
SBA PPP loans | SBA PPP Loans - Round 2 | Subsequent Event |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Gross loans | 8,000 |  |  |  |
Net Deferred Fee Income | $ 800 |  |  |  |

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