Stockholders' Equity (Schedule Of Changes in Accumulated Other Comprehensive Income by Component Net of Tax) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Tax [Roll Froward] [Roll Forward]
AOCI Tax (Beginning balance)	$ (261,000)	$ 24,000	$ 3,000
Other Comprehensive Income (Loss) before Reclassifications, Tax	3,062,000	(572,000)	21,000
Reclassification from AOCI, Current Period, Tax	2,668,000	(287,000)	0
Other Comprehensive Income (Loss), Tax	394,000	(285,000)	21,000
AOCI Tax (Ending balance)	133,000	(261,000)	24,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	1,938,000	3,000	38,000
Other comprehensive (loss) income before reclassifications	(7,745,000)	2,468,000	418,000
Amounts reclassified from accumulated other comprehensive income (loss)	(4,956,000)	533,000	453,000
Net current period other comprehensive loss	(2,789,000)	1,935,000	(35,000)
Ending balance	(851,000)	1,938,000	3,000
Gains and losses on available for sale securities [Member]
Accumulated Other Comprehensive Income (Loss), Before Tax [ Roll Forward] [Roll Forward]
AOCI before tax (Beginning)	(31,000)	(64,000)	(8,000)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(115,000)	33,000	(56,000)
Reclassification from AOCI, Current Period, before Tax	0	0	0
Other Comprehensive Income (Loss), before Tax	(115,000)	33,000	(56,000)
AOCI before Tax (Ending)	(146,000)	(31,000)	(64,000)
Gains and losses on derivatives [Member]
Accumulated Other Comprehensive Income (Loss), Before Tax [ Roll Forward] [Roll Forward]
AOCI before tax (Beginning)	2,230,000	43,000	43,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(10,692,000)	3,007,000	453,000
Reclassification from AOCI, Current Period, before Tax	(7,624,000)	820,000	453,000
Other Comprehensive Income (Loss), before Tax	(3,068,000)	2,187,000	0
AOCI before Tax (Ending)	$ (838,000)	$ 2,230,000	$ 43,000