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SECURITIES: (Details Textual) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 USD ($) | Dec. 31, 2015 USD ($) cdo | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 30, 2013 USD ($) | Dec. 31, 2012 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Securities pledged as collateral |  | $ 406,800,000 | $ 412,500,000 |  |  |
Gain on sale of investments |  | 23,000 | 2,000 |  |  |
Loss on sale of investments |  | $ 6,000 | 5,000 |  |  |
Number of investment securities with an amortized cost greater than fair value (investments) |  | 101 |  |  |  |
Cumulative OTTI charges |  | $ 13,995,000 | 14,050,000 | $ 14,079,000 |  | $ 14,983,000
Amortized Cost |  | 876,796,000 | 880,946,000 |  |  |
Securities available-for-sale |  | 891,082,000 | 897,053,000 |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ 6,719,000 | $ 8,189,000 |  |  |
Standard Poors | Minimum |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Credit quality indicator pricing |  | 44.98 |  |  |  |
Standard Poors | Maximum |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Credit quality indicator pricing |  | 63.92 |  |  |  |
Moody Investor Service | Minimum |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Credit quality indicator pricing |  | 7.3 |  |  |  |
Moody Investor Service | Maximum |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Credit quality indicator pricing |  | 16.47 |  |  |  |
Other Than Temporarily Impaired Cdo [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Number of CDO's | cdo |  | 3 |  |  |  |
Contractual balance |  | $ 25,800,000 |  |  |  |
Reduced balance |  | 14,900,000 |  |  |  |
Interest payment received |  | 2,200,000 |  |  |  |
Cumulative OTTI charges |  | 14,000,000 |  |  |  |
Other comprehensive income net |  | $ 5,300,000 |  |  |  |
Base discount rate, which is subject to an additional margin |  | 3 month LIBOR |  |  |  |
Other Than Temporarily Impaired Cdo [Member] | Minimum |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Severity of OTTI (as a percent) |  | 28.00% |  |  |  |
Other Than Temporarily Impaired Cdo [Member] | Maximum |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Severity of OTTI (as a percent) |  | 92.00% |  |  |  |
Collateralized debt obligations |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Payment received | $ 1,300,000 |  |  |  |  |
CDO payment receivable |  |  |  |  | $ 200,000 |
London Interbank Offered Rate (LIBOR) [Member] | Other Than Temporarily Impaired Cdo [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [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% |  |  |  |

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