ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS): (AOCI rollforward) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period			$ (1,669)
Amounts reclassified from accumulated other comprehensive income/loss			321	$ 3,027
Net current-period other comprehensive income/loss, net of taxes	$ (2,095)	$ 5,219	1,997	6,044
Balance at the end of the period	328		328
Unrealized gains / losses on available-for-sale securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period			(578)	(374)
Other comprehensive income/loss before reclassifications			166	195
Amounts reclassified from accumulated other comprehensive income/loss			482	17
Net current-period other comprehensive income/loss, net of taxes			648	212
Balance at the end of the period	70	(162)	70	(162)
Gains/losses on derivatives [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period			(1,091)	(3,646)
Other comprehensive income/loss before reclassifications			1,510	2,822
Amounts reclassified from accumulated other comprehensive income/loss			(161)	3,010
Net current-period other comprehensive income/loss, net of taxes			1,349	5,832
Balance at the end of the period	258	2,186	258	2,186
Total [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period			(1,669)	(4,020)
Other comprehensive income/loss before reclassifications			1,676	3,017
Amounts reclassified from accumulated other comprehensive income/loss			321	3,027
Net current-period other comprehensive income/loss, net of taxes			1,997	6,044
Balance at the end of the period	$ 328	$ 2,024	$ 328	$ 2,024