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SECURITIES: (Details Textual) - USD ($) | 2 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 04, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Securities pledged as collateral |  | $ 596,200,000 | $ 393,300,000 |  |
Gain on sale of investments |  | 55,000 | 5,000 |  |
Loss on sale of investments |  | $ 11,000 | 126,000 |  |
Number of investment securities with an amortized cost greater than fair value (investments) |  | 97 |  |  |
Cumulative OTTI charges |  | $ 2,974,000 | 2,974,000 | $ 7,132,000 | $ 13,974,000
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale |  | 181,763,000 | 143,157,000 | $ 141,819,000 |
Amortized Cost |  | 907,575,000 | 793,084,000 |  |
Securities available-for-sale |  | 926,717,000 | 784,916,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 1,834,000 | $ 15,214,000 |  |
Other Than Temporarily Impaired Cdo [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Contractual balance |  | 3,700,000 |  |  |
Reduced balance |  | 3,600,000 |  |  |
Interest payment received |  | 800,000 |  |  |
Cumulative OTTI charges |  | 3,000,000 |  |  |
Other comprehensive income net |  | $ 3,600,000 |  |  |
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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- Definition Represents the reference rate for the variable rate of discount rate used to calculate present value of expected future cash flows on available-for-sale securities, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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