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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) loan | Mar. 31, 2019 USD ($) loan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Related Parties, Description | At March 31, 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, 2019 and December 31, 2018, outstanding loans to certain officers, directors and their associated companies was less than 5% of the Company's shareholders' equity. |
Allowance for credit losses | $ 26,521 | $ 25,201 | $ 25,171 | $ 24,712
Other industry exposures | 0 |  |  |
Interest lost on nonaccrual loans | $ 79 | $ 109 |  |
Loans modified | loan | 0 | 0 |  |
Proceeds from the sale of mortgage loans | $ 70,711 | $ 28,834 |  |
Gain on sale of mortgage loans | 1,476 | $ 826 |  |
Loans held for sale, at fair value (book value of $28,356 and $11,915, respectively) | 27,730 |  | 11,854 |
FHLB advances, general debt obligations, pledged collateral | $ 1,400,000 |  | 1,400,000 |
Financing Receivable, Modifications, Number of Contracts | loan | 0 | 0 |  |
Q-factor |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | $ 800 |  |  |
Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans restructured due to credit difficulties that are now performing | 3,000 |  | 3,000 |
Financing receivables impaired TDR non-performing | 400 |  | 636 |
Residential Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | 5,897 | $ 6,153 | 5,842 | 6,071
Mortgage Loans in Process of Foreclosure, Amount | 1,400 |  | 1,300 |
Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | 13,374 | 11,838 | 12,414 | 11,654
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | 4,114 | 3,616 | 3,769 | 3,620
Home Equity |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | 2,480 | 3,027 | 2,423 | 2,796
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | 473 | 259 | 507 | 234
HPFC Portfolio Segment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | 183 | 308 | 216 | $ 337
Fixed Rate Residential Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Proceeds from the sale of mortgage loans | 69,200 | 28,000 |  |
Gain on sale of mortgage loans | 1,500 | 800 |  |
Loans held for sale, at fair value (book value of $28,356 and $11,915, respectively) | 28,400 |  | 11,900 |
Nonoperating Income (Expense) | Fixed Rate Residential Mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gain on sale of mortgage loans | 565 | $ (4) |  |
Unrealized gain (loss) on loans held for sale | $ 626 |  | $ 61 |
Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Months | 18 |  |  |
Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Months | 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% |  |  |

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