Investment Securities (Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	$ 440,162	$ 758,304
Less than 12 months, Unrealized Losses	(1,729)	(5,555)
12 months or longer, Fair Value	468,499	1,053,424
12 months or longer, Unrealized Losses	(8,639)	(37,057)
Total Fair Value	908,661	1,811,728
Total Unrealized Losses	(10,368)	(42,612)
Government Agency Issued Collateralized Mortgage Obligations ("CMO")
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	370,165	724,834
Less than 12 months, Unrealized Losses	(1,487)	(5,113)
12 months or longer, Fair Value	435,331	949,556
12 months or longer, Unrealized Losses	(7,720)	(34,886)
Total Fair Value	805,496	1,674,390
Total Unrealized Losses	(9,207)	(39,999)
Government Agency Issued Mortgage-Backed Securities ("MBS")
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	69,997	32,621
Less than 12 months, Unrealized Losses	(242)	(244)
12 months or longer, Fair Value	32,538	103,858
12 months or longer, Unrealized Losses	(458)	(2,137)
Total Fair Value	102,535	136,479
Total Unrealized Losses	(700)	(2,381)
Total debt securities
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	440,162	757,455
Less than 12 months, Unrealized Losses	(1,729)	(5,357)
12 months or longer, Fair Value	467,869	1,053,414
12 months or longer, Unrealized Losses	(8,178)	(37,023)
Total Fair Value	908,031	1,810,869
Total Unrealized Losses	(9,907)	(42,380)
Equity
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	0	849
Less than 12 months, Unrealized Losses	0	(198)
12 months or longer, Fair Value	630	10
12 months or longer, Unrealized Losses	(461)	(34)
Total Fair Value	630	859
Total Unrealized Losses	$ (461)	$ (232)