Investment Securities (Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	$ 7,328	$ 849
Available-for-sale, Less than 12 months - Estimated fair value	386,486	157,086
Available-for-sale, 12 months or more - Gross unrealized losses	288,361	697,086
Available-for-sale, 12 months or more - Estimated fair value	1,001,740	887,841
Available-for-sale, Total - Gross unrealized losses	295,689	697,935
Available-for-sale, Total - Estimated fair value	1,388,226	1,044,927
Investment Securities Gross Unrealized Losses Less Than 12 Months	11,353	1,479
Investment Securities Estimated Fair Value Less Than 12 Months	456,886	199,699
Investment Securities Gross Unrealized Losses 12 Months or More	331,853	837,718
Investment Securities Estimated Fair Value 12 Months or More	1,062,162	1,030,674
Investment Securities Gross Unrealized Losses Total	343,206	839,197
Investment Securities Estimated Fair Value Total	1,519,048	1,230,373
Municipal Securities [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses	4,025	630
Held-to-maturity, Less than 12 months - Estimated fair value	70,400	42,613
Held-to-maturity, 12 months or more - Gross unrealized losses	591	79
Held-to-maturity, 12 months or more - Estimated fair value	9,103	5,910
Held-to-maturity, Total - Gross unrealized losses	4,616	709
Held-to-maturity, Total - Estimated fair value	79,503	48,523
Available-for-sale, Less than 12 months - Gross unrealized losses	73	61
Available-for-sale, Less than 12 months - Estimated fair value	8,834	4,898
Available-for-sale, 12 months or more - Gross unrealized losses	417	1,909
Available-for-sale, 12 months or more - Estimated fair value	3,179	11,768
Available-for-sale, Total - Gross unrealized losses	490	1,970
Available-for-sale, Total - Estimated fair value	12,013	16,666
Agency Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	828	35
Available-for-sale, Less than 12 months - Estimated fair value	47,862	18,633
Available-for-sale, 12 months or more - Gross unrealized losses	73	81
Available-for-sale, 12 months or more - Estimated fair value	5,874	6,916
Available-for-sale, Total - Gross unrealized losses	901	116
Available-for-sale, Total - Estimated fair value	53,736	25,549
Agency Guaranteed Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	1,231	10
Available-for-sale, Less than 12 months - Estimated fair value	64,533	6,032
Available-for-sale, 12 months or more - Gross unrealized losses	6	6
Available-for-sale, 12 months or more - Estimated fair value	935	629
Available-for-sale, Total - Gross unrealized losses	1,237	16
Available-for-sale, Total - Estimated fair value	65,468	6,661
Small Business Administration Loan-Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	1,709	91
Available-for-sale, Less than 12 months - Estimated fair value	187,680	15,199
Available-for-sale, 12 months or more - Gross unrealized losses	1,062	548
Available-for-sale, 12 months or more - Estimated fair value	39,256	69,011
Available-for-sale, Total - Gross unrealized losses	2,771	639
Available-for-sale, Total - Estimated fair value	226,936	84,210
Mutual Funds And Other [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	943	652
Available-for-sale, Less than 12 months - Estimated fair value	24,057	112,324
Available-for-sale, 12 months or more - Gross unrealized losses	6,478	0
Available-for-sale, 12 months or more - Estimated fair value	103,614	0
Available-for-sale, Total - Gross unrealized losses	7,421	652
Available-for-sale, Total - Estimated fair value	127,671	112,324
Held-To-Maturity [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses	4,025	630
Held-to-maturity, Less than 12 months - Estimated fair value	70,400	42,613
Held-to-maturity, 12 months or more - Gross unrealized losses	43,492	140,632
Held-to-maturity, 12 months or more - Estimated fair value	60,422	142,833
Held-to-maturity, Total - Gross unrealized losses	47,517	141,262
Held-to-maturity, Total - Estimated fair value	130,822	185,446
Available-for-sale Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	6,385	197
Available-for-sale, Less than 12 months - Estimated fair value	362,429	44,762
Available-for-sale, 12 months or more - Gross unrealized losses	281,883	697,086
Available-for-sale, 12 months or more - Estimated fair value	898,126	887,841
Available-for-sale, Total - Gross unrealized losses	288,268	697,283
Available-for-sale, Total - Estimated fair value	1,260,555	932,603
Asset-Backed Securities [Member] | Trust Preferred Securities - Banks And Insurance [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses	0	0
Held-to-maturity, Less than 12 months - Estimated fair value	0	0
Held-to-maturity, 12 months or more - Gross unrealized losses	42,901	129,560
Held-to-maturity, 12 months or more - Estimated fair value	51,319	126,019
Held-to-maturity, Total - Gross unrealized losses	42,901	129,560
Held-to-maturity, Total - Estimated fair value	51,319	126,019
Available-for-sale, Less than 12 months - Gross unrealized losses	2,539	0
Available-for-sale, Less than 12 months - Estimated fair value	51,911	0
Available-for-sale, 12 months or more - Gross unrealized losses	280,304	663,451
Available-for-sale, 12 months or more - Estimated fair value	847,990	765,421
Available-for-sale, Total - Gross unrealized losses	282,843	663,451
Available-for-sale, Total - Estimated fair value	899,901	765,421
Asset-Backed Securities [Member] | Other [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses	0	0
Held-to-maturity, Less than 12 months - Estimated fair value	0	0
Held-to-maturity, 12 months or more - Gross unrealized losses	0	10,993
Held-to-maturity, 12 months or more - Estimated fair value	0	10,904
Held-to-maturity, Total - Gross unrealized losses	0	10,993
Held-to-maturity, Total - Estimated fair value	0	10,904
Available-for-sale, Less than 12 months - Gross unrealized losses	0	0
Available-for-sale, Less than 12 months - Estimated fair value	0	0
Available-for-sale, 12 months or more - Gross unrealized losses	0	6,941
Available-for-sale, 12 months or more - Estimated fair value	0	15,234
Available-for-sale, Total - Gross unrealized losses	0	6,941
Available-for-sale, Total - Estimated fair value	0	15,234
Asset-Backed Securities [Member] | Other Debt Securities [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses		0
Held-to-maturity, Less than 12 months - Estimated fair value		0
Held-to-maturity, 12 months or more - Gross unrealized losses		0
Held-to-maturity, 12 months or more - Estimated fair value		0
Held-to-maturity, Total - Gross unrealized losses		0
Held-to-maturity, Total - Estimated fair value		0
Asset-Backed Securities [Member] | Trust Preferred Securities - Real Estate Investment Trusts [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	0	0
Available-for-sale, Less than 12 months - Estimated fair value	0	0
Available-for-sale, 12 months or more - Gross unrealized losses	0	24,082
Available-for-sale, 12 months or more - Estimated fair value	0	16,403
Available-for-sale, Total - Gross unrealized losses	0	24,082
Available-for-sale, Total - Estimated fair value	0	16,403
Asset-Backed Securities [Member] | Auction Rate Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	5	0
Available-for-sale, Less than 12 months - Estimated fair value	1,609	0
Available-for-sale, 12 months or more - Gross unrealized losses	21	68
Available-for-sale, 12 months or more - Estimated fair value	892	2,459
Available-for-sale, Total - Gross unrealized losses	26	68
Available-for-sale, Total - Estimated fair value	$ 2,501	$ 2,459