SECURITIES: (Details Textual)	2 Months Ended	3 Months Ended	12 Months Ended
	Mar. 09, 2017 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2016 USD ($) cdo	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Securities pledged as collateral			$ 391,100,000	$ 406,800,000
Gain on sale of investments			39,000	23,000
Loss on sale of investments			$ 5,000	5,000
Number of investment securities with an amortized cost greater than fair value (investments)			271
Cumulative OTTI charges			$ 13,974,000	13,995,000	$ 14,050,000		$ 14,079,000
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities			168,506,000	150,315,000	$ 136,141,000
Amortized Cost			855,521,000	876,796,000
Securities available-for-sale			853,725,000	891,082,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss			$ 14,414,000	$ 6,719,000
Standard Poors | Minimum
Schedule of Available-for-sale Securities [Line Items]
Credit quality indicator pricing			39.8
Standard Poors | Maximum
Schedule of Available-for-sale Securities [Line Items]
Credit quality indicator pricing			50.41
Moody Investor Service | Minimum
Schedule of Available-for-sale Securities [Line Items]
Credit quality indicator pricing			14.59
Moody Investor Service | Maximum
Schedule of Available-for-sale Securities [Line Items]
Credit quality indicator pricing			45.43
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			12,400,000
Interest payment received			2,600,000
Cumulative OTTI charges			14,000,000
Other comprehensive income net			$ 3,200,000
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)			93.00%
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%
Subsequent Event [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	$ 3,100,000