Investment Securities (Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	$ 61,270,000	$ 443,866,000
Less than 12 months, Unrealized Losses	(308,000)	(1,969,000)
12 months or longer, Fair Value	310,888,000	519,915,000
12 months or longer, Unrealized Losses	(3,429,000)	(9,350,000)
Total Fair Value	372,158,000	963,781,000
Total Unrealized Losses	(3,737,000)	(11,319,000)
Government Agency Issued Collateralized Mortgage Obligations ("CMO")
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	18,904,000	417,267,000
Less than 12 months, Unrealized Losses	(214,000)	(1,729,000)
12 months or longer, Fair Value	310,888,000	485,053,000
12 months or longer, Unrealized Losses	(3,429,000)	(8,698,000)
Total Fair Value	329,792,000	902,320,000
Total Unrealized Losses	(3,643,000)	(10,427,000)
Government Agency Issued Mortgage-Backed Securities ("MBS")
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	42,106,000	25,712,000
Less than 12 months, Unrealized Losses	(84,000)	(79,000)
12 months or longer, Fair Value	0	34,853,000
12 months or longer, Unrealized Losses	0	(617,000)
Total Fair Value	42,106,000	60,565,000
Total Unrealized Losses	(84,000)	(696,000)
Total debt securities
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	61,010,000	442,979,000
Less than 12 months, Unrealized Losses	(298,000)	(1,808,000)
12 months or longer, Fair Value	310,888,000	519,906,000
12 months or longer, Unrealized Losses	(3,429,000)	(9,315,000)
Total Fair Value	371,898,000	962,885,000
Total Unrealized Losses	(3,727,000)	(11,123,000)
Equity
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	260,000	887,000
Less than 12 months, Unrealized Losses	(10,000)	(161,000)
12 months or longer, Fair Value	0	9,000
12 months or longer, Unrealized Losses	0	(35,000)
Total Fair Value	260,000	896,000
Total Unrealized Losses	$ (10,000)	$ (196,000)