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FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK: (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |  |  |
Other Commitments |  |  | $ 105,872,000 | $ 81,593,000
TOTAL |  |  | 551,760,000 | 424,458,000
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates | $ 0.0425 | $ 0.0450 |  |
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates | $ 0.0725 | $ 0.0775 |  |
Commercial Operating Lines |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
TOTAL |  |  | 358,561,000 | 285,524,000
Commercial letters of credit |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
TOTAL |  |  | 3,851,000 | 4,673,000
Home Equity |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
TOTAL |  |  | $ 87,327,000 | $ 57,341,000

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