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SECURITIES: (Details Textual) | 2 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 06, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Securities pledged as collateral |  | $ 393,300,000 | $ 423,900,000 |  |
Gain on sale of investments |  | 5,000 | 185,000 |  |
Loss on sale of investments |  | $ 3,000 | 5,000 |  |
Number of investment securities with an amortized cost greater than fair value (investments) |  | 335 |  |  |
Cumulative OTTI charges |  | $ 2,974,000 | 7,132,000 | $ 13,974,000 | $ 13,995,000
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale |  | 143,157,000 | 141,819,000 | $ 168,506,000 |
Amortized Cost |  | 793,084,000 | 811,369,000 |  |
Securities available-for-sale |  | 784,916,000 | 814,931,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ 15,214,000 | $ 9,535,000 |  |
Standard Poors | Minimum |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Credit quality indicator pricing |  | 81.46 |  |  |
Moody Investor Service | Minimum |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Credit quality indicator pricing |  | 21.14 |  |  |
Other Than Temporarily Impaired Cdo [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Contractual balance |  | $ 3,700,000 |  |  |
Reduced balance |  | 3,300,000 |  |  |
Interest payment received |  | 600,000 |  |  |
Cumulative OTTI charges |  | 3,000,000 |  |  |
Other comprehensive income net |  | $ 3,100,000 |  |  |
Base discount rate, which is subject to an additional margin |  | 3 month LIBOR |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Other Than Temporarily Impaired Cdo [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Available For Sale Securities Present Value Of Future Cash Flows Discount Rate, Basis Point Spread on Variable Rate Basis, Minimum |  | 1.60% |  |  |
Available For Sale Securities Present Value Of Future Cash Flows Discount Rate, Basis Point Spread on Variable Rate Basis, Maximum |  | 1.80% |  |  |
Subsequent Event [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale | $ 3,100,000 |  |  |  |

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