Investment Securities (Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	$ 358,759	$ 440,162
Less than 12 months, Unrealized Losses	(680)	(1,729)
12 months or longer, Fair Value	142,060	468,499
12 months or longer, Unrealized Losses	(1,477)	(8,639)
Total Fair Value	500,819	908,661
Total Unrealized Losses	(2,157)	(10,368)
Government Agency Issued Collateralized Mortgage Obligations ("CMO")
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	320,282	370,165
Less than 12 months, Unrealized Losses	(631)	(1,487)
12 months or longer, Fair Value	142,060	435,331
12 months or longer, Unrealized Losses	(1,477)	(7,720)
Total Fair Value	462,342	805,496
Total Unrealized Losses	(2,108)	(9,207)
Government Agency Issued Mortgage-Backed Securities ("MBS")
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	38,477	69,997
Less than 12 months, Unrealized Losses	(49)	(242)
12 months or longer, Fair Value	0	32,538
12 months or longer, Unrealized Losses	0	(458)
Total Fair Value	38,477	102,535
Total Unrealized Losses	$ (49)	(700)
Total debt securities
Schedule of Investments [Line Items]
Less than 12 months, Fair Value		440,162
Less than 12 months, Unrealized Losses		(1,729)
12 months or longer, Fair Value		467,869
12 months or longer, Unrealized Losses		(8,178)
Total Fair Value		908,031
Total Unrealized Losses		(9,907)
Equity
Schedule of Investments [Line Items]
Less than 12 months, Fair Value		0
Less than 12 months, Unrealized Losses		0
12 months or longer, Fair Value		630
12 months or longer, Unrealized Losses		(461)
Total Fair Value		630
Total Unrealized Losses		$ (461)