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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) loan | Sep. 30, 2019 USD ($) loan | Sep. 30, 2020 USD ($) loan | Sep. 30, 2019 USD ($) loan | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and Leases Receivable, Related Parties, Description |  |  | At September 30, 2020 and December 31, 2019, outstanding loans to certain officers, directors and their associated companies was less than 5% of the Company's shareholders' equity. |  | At September 30, 2020 and December 31, 2019, outstanding loans to certain officers, directors and their associated companies was less than 5% of the Company's shareholders' equity.
Other industry exposures |  |  | 0 |  |
Interest lost on nonaccrual loans | $ 85 | $ 106 | $ 251 | $ 330 |
Recorded Investment | $ 3,405 |  | $ 3,405 |  | $ 3,629
Financing Receivable, Modifications, Number of Contracts | loan | 0 | 0 | 0 | 0 |
Loans modified | loan | 0 | 0 | 0 | 0 |
Proceeds from the sale of mortgage loans |  |  | $ 460,130 | $ 168,394 |
Gain on sale of mortgage loans |  |  | (10,385) | (3,928) |
Loans held for sale, at fair value (book value of $37,301 and $11,915, respectively) | $ 37,935 |  | 37,935 |  | 11,854
FHLB advances, general debt obligations, pledged collateral | 1,300,000 |  | $ 1,300,000 |  | 1,400,000
SBA PPP Loans, Total Originations, Number of Loans | loan |  |  | 3,034 |  |
SBA PPP Loans, Total Originations |  |  | $ 244,800 |  |
Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Mortgage Loans in Process of Foreclosure, Amount | 1,700 |  | 1,700 |  | 1,300
Fixed Rate Residential Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from the sale of mortgage loans | 182,700 | $ 86,900 | 449,700 | 164,500 |
Gain on sale of mortgage loans | (4,300) | (1,900) | (10,400) | (3,900) |
Loans held for sale, at fair value (book value of $37,301 and $11,915, respectively) | 37,300 |  | 37,300 |  | 11,900
Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Recorded Investment | 107 |  | 107 |  | 123
Nonoperating Income (Expense) | Fixed Rate Residential Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gain on sale of mortgage loans | $ 47,000 | $ 205 | (695) | $ 269 |
Unrealized gain (loss) on loans held for sale |  |  | $ 634 |  | (61)
Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Months | 18 |  | 18 |  |
Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Months | 24 |  | 24 |  |
Non-Residential Building Operators Industry Sector | Loan Concentration Risk | Total Loan Portfolio |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Concentration risk (percentage) |  |  | 13.00% |  |
Non-Residential Building Operators Industry Sector | Loan Concentration Risk | Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Concentration risk (percentage) |  |  | 32.00% |  |
Performing | Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Recorded Investment | $ 3,000 |  | $ 3,000 |  | 3,000
Non-performing | Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Recorded Investment | $ 454 |  | $ 454 |  | $ 636

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