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FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK: (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Loss Contingencies [Line Items] |  |  |  |
Other Commitments |  |  | $ 81,593,000 | $ 83,786,000
TOTAL |  |  | 424,458,000 | 387,701,000
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates | $ 0.0450 | $ 0.0400 |  |
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loans and Leases Receivable, Commitments, Fixed Rates | $ 0.0775 | $ 0.0725 |  |
Commercial Operating Lines |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
TOTAL |  |  | 285,524,000 | 246,855,000
Commercial letters of credit |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
TOTAL |  |  | 4,673,000 | 5,012,000
Home Equity |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
TOTAL |  |  | $ 57,341,000 | $ 57,060,000

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