Investment Securities (Fair Value, Unrealized Losses, And Number Of Issuances Of The Temporarily Impaired Securities) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Fair Value of Securities Held-to-Maturity, Less than 12 months	$ 248,776	$ 220,554
Fair Value of Securities Held-to-Maturity, 12 months or longer
Fair Value of Securities Held-to-Maturity, Total	248,776	220,554
Unrealized Losses on Securities Held-to-Maturity, Less than 12 months	3,791	10,612
Unrealized Losses on Securities Held-to-Maturity, 12 months or longer
Unrealized Losses on Securities Held-to-Maturity, Total	3,791	10,612
No. of Issuances of Securities Held-to-Maturity, Less than 12 months	89	125
No. of Issuances of Securities Held-to-Maturity, 12 months or longer
No. of Issuances of Securities Held-to-Maturity, Total	89	125
Fair Value of Securities Available-for-Sale, Less than 12 months	583,484	1,023,959
Fair Value of Securities Available-for-Sale, 12 months or longer	25,412	11,286
Fair Value of Securities Available-for-Sale, Total	608,896	1,035,245
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	10,630	20,427
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	1,212	239
Unrealized Losses of Securities Available-for-Sale, Total	11,842	20,666
No. of Issuances of Securities Available-for-Sale, Less than 12 months	43	59
No. of Issuances of Securities Available-for-Sale, 12 months or longer	11	9
No. of Issuances of Securities Available-for-Sale, Total	54	68
U.S. Treasury Securities [Member]
Fair Value of Securities Available-for-Sale, Less than 12 months	121,982	118,828
Fair Value of Securities Available-for-Sale, 12 months or longer
Fair Value of Securities Available-for-Sale, Total	121,982	118,828
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	3,552	6,745
Unrealized Losses of Securities Available-for-Sale, 12 months or longer
Unrealized Losses of Securities Available-for-Sale, Total	3,552	6,745
No. of Issuances of Securities Available-for-Sale, Less than 12 months	1	5
No. of Issuances of Securities Available-for-Sale, 12 months or longer
No. of Issuances of Securities Available-for-Sale, Total	1	5
U.S. Government Sponsored Entities [Member]
Fair Value of Securities Available-for-Sale, Less than 12 months	99,640	578,118
Fair Value of Securities Available-for-Sale, 12 months or longer
Fair Value of Securities Available-for-Sale, Total	99,640	578,118
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	360	6,840
Unrealized Losses of Securities Available-for-Sale, 12 months or longer
Unrealized Losses of Securities Available-for-Sale, Total	360	6,840
No. of Issuances of Securities Available-for-Sale, Less than 12 months	2	12
No. of Issuances of Securities Available-for-Sale, 12 months or longer
No. of Issuances of Securities Available-for-Sale, Total	2	12
State And Municipal Securities [Member]
Fair Value of Securities Held-to-Maturity, Less than 12 months	90,200	121,161
Fair Value of Securities Held-to-Maturity, 12 months or longer
Fair Value of Securities Held-to-Maturity, Total	90,200	121,161
Unrealized Losses on Securities Held-to-Maturity, Less than 12 months	2,191	8,946
Unrealized Losses on Securities Held-to-Maturity, 12 months or longer
Unrealized Losses on Securities Held-to-Maturity, Total	2,191	8,946
No. of Issuances of Securities Held-to-Maturity, Less than 12 months	84	122
No. of Issuances of Securities Held-to-Maturity, 12 months or longer
No. of Issuances of Securities Held-to-Maturity, Total	84	122
Fair Value of Securities Available-for-Sale, Less than 12 months	1,302	1,718
Fair Value of Securities Available-for-Sale, 12 months or longer
Fair Value of Securities Available-for-Sale, Total	1,302	1,718
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	66	157
Unrealized Losses of Securities Available-for-Sale, 12 months or longer
Unrealized Losses of Securities Available-for-Sale, Total	66	157
No. of Issuances of Securities Available-for-Sale, Less than 12 months	1	2
No. of Issuances of Securities Available-for-Sale, 12 months or longer
No. of Issuances of Securities Available-for-Sale, Total	1	2
Mortgage-Backed Securities [Member]
Fair Value of Securities Held-to-Maturity, Less than 12 months	148,614	89,439
Fair Value of Securities Held-to-Maturity, 12 months or longer
Fair Value of Securities Held-to-Maturity, Total	148,614	89,439
Unrealized Losses on Securities Held-to-Maturity, Less than 12 months	1,593	1,653
Unrealized Losses on Securities Held-to-Maturity, 12 months or longer
Unrealized Losses on Securities Held-to-Maturity, Total	1,593	1,653
No. of Issuances of Securities Held-to-Maturity, Less than 12 months	4	2
No. of Issuances of Securities Held-to-Maturity, 12 months or longer
No. of Issuances of Securities Held-to-Maturity, Total	4	2
Fair Value of Securities Available-for-Sale, Less than 12 months	51,043	354
Fair Value of Securities Available-for-Sale, 12 months or longer	37	32
Fair Value of Securities Available-for-Sale, Total	51,080	386
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	504	4
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	1	1
Unrealized Losses of Securities Available-for-Sale, Total	505	5
No. of Issuances of Securities Available-for-Sale, Less than 12 months	7	7
No. of Issuances of Securities Available-for-Sale, 12 months or longer	2	1
No. of Issuances of Securities Available-for-Sale, Total	9	8
Mortgage-Backed Securities-Non-Agency [Member]
Fair Value of Securities Available-for-Sale, Less than 12 months	2,604
Fair Value of Securities Available-for-Sale, 12 months or longer	5,309	10,127
Fair Value of Securities Available-for-Sale, Total	7,913	10,127
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	73
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	148	118
Unrealized Losses of Securities Available-for-Sale, Total	221	118
No. of Issuances of Securities Available-for-Sale, Less than 12 months	1
No. of Issuances of Securities Available-for-Sale, 12 months or longer	2	3
No. of Issuances of Securities Available-for-Sale, Total	3	3
Other Debt Securities [Member]
Fair Value of Securities Held-to-Maturity, Less than 12 months	9,962	9,954
Fair Value of Securities Held-to-Maturity, 12 months or longer	0
Fair Value of Securities Held-to-Maturity, Total	9,962	9,954
Unrealized Losses on Securities Held-to-Maturity, Less than 12 months	7	13
Unrealized Losses on Securities Held-to-Maturity, 12 months or longer	0
Unrealized Losses on Securities Held-to-Maturity, Total	7	13
No. of Issuances of Securities Held-to-Maturity, Less than 12 months	1	1
No. of Issuances of Securities Held-to-Maturity, 12 months or longer	0
No. of Issuances of Securities Held-to-Maturity, Total	1	1
Collateralized Mortgage Obligations [Member]
Fair Value of Securities Available-for-Sale, Less than 12 months
Fair Value of Securities Available-for-Sale, 12 months or longer	847	887
Fair Value of Securities Available-for-Sale, Total	847	887
Unrealized Losses of Securities Available-for-Sale, Less than 12 months
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	95	115
Unrealized Losses of Securities Available-for-Sale, Total	95	115
No. of Issuances of Securities Available-for-Sale, Less than 12 months
No. of Issuances of Securities Available-for-Sale, 12 months or longer	4	4
No. of Issuances of Securities Available-for-Sale, Total	4	4
Asset-Backed Securities [Member]
Fair Value of Securities Available-for-Sale, Less than 12 months
Fair Value of Securities Available-for-Sale, 12 months or longer	183	240
Fair Value of Securities Available-for-Sale, Total	183	240
Unrealized Losses of Securities Available-for-Sale, Less than 12 months
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	4	5
Unrealized Losses of Securities Available-for-Sale, Total	4	5
No. of Issuances of Securities Available-for-Sale, Less than 12 months
No. of Issuances of Securities Available-for-Sale, 12 months or longer	1	1
No. of Issuances of Securities Available-for-Sale, Total	1	1
Corporate Bonds [Member]
Fair Value of Securities Available-for-Sale, Less than 12 months	258,820	283,376
Fair Value of Securities Available-for-Sale, 12 months or longer	19,036
Fair Value of Securities Available-for-Sale, Total	277,856	283,376
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	5,322	5,792
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	964
Unrealized Losses of Securities Available-for-Sale, Total	6,286	5,792
No. of Issuances of Securities Available-for-Sale, Less than 12 months	25	27
No. of Issuances of Securities Available-for-Sale, 12 months or longer	2
No. of Issuances of Securities Available-for-Sale, Total	27	27
Mutual Funds [Member]
Fair Value of Securities Available-for-Sale, Less than 12 months	3,967	3,927
Fair Value of Securities Available-for-Sale, 12 months or longer
Fair Value of Securities Available-for-Sale, Total	3,967	3,927
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	33	73
Unrealized Losses of Securities Available-for-Sale, 12 months or longer
Unrealized Losses of Securities Available-for-Sale, Total	33	73
No. of Issuances of Securities Available-for-Sale, Less than 12 months	1	1
No. of Issuances of Securities Available-for-Sale, 12 months or longer
No. of Issuances of Securities Available-for-Sale, Total	1	1
Other Foreign Debt Securities [Member]
Fair Value of Securities Available-for-Sale, Less than 12 months	39,317	27,254
Fair Value of Securities Available-for-Sale, 12 months or longer
Fair Value of Securities Available-for-Sale, Total	39,317	27,254
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	683	646
Unrealized Losses of Securities Available-for-Sale, 12 months or longer
Unrealized Losses of Securities Available-for-Sale, Total	683	646
No. of Issuances of Securities Available-for-Sale, Less than 12 months	3	3
No. of Issuances of Securities Available-for-Sale, 12 months or longer
No. of Issuances of Securities Available-for-Sale, Total	3	3
Trust Preferred Securities [Member]
Fair Value of Securities Available-for-Sale, Less than 12 months	4,809	10,384
Fair Value of Securities Available-for-Sale, 12 months or longer
Fair Value of Securities Available-for-Sale, Total	4,809	10,384
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	37	170
Unrealized Losses of Securities Available-for-Sale, 12 months or longer
Unrealized Losses of Securities Available-for-Sale, Total	37	170
No. of Issuances of Securities Available-for-Sale, Less than 12 months	2	2
No. of Issuances of Securities Available-for-Sale, 12 months or longer
No. of Issuances of Securities Available-for-Sale, Total	2	2
Total Investment Securities [Member]
Fair Value of Securities Available-for-Sale, Less than 12 months	832,260	1,244,513
Fair Value of Securities Available-for-Sale, 12 months or longer	25,412	11,286
Fair Value of Securities Available-for-Sale, Total	857,672	1,255,799
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	14,421	31,039
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	1,212	239
Unrealized Losses of Securities Available-for-Sale, Total	$ 15,633	$ 31,278
No. of Issuances of Securities Available-for-Sale, Less than 12 months	132	184
No. of Issuances of Securities Available-for-Sale, 12 months or longer	11	9
No. of Issuances of Securities Available-for-Sale, Total	143	193