Investment Securities (Fair Value, Unrealized Losses, And Number Of Issuances Of The Temporarily Impaired Securities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 securities	Dec. 31, 2010 securities
Schedule of Investments [Line Items]
Fair Value of Securities Held-to-Maturity, Less than 12 months	$ 9,635	$ 220,554
Fair Value of Securities Held-to-Maturity, Total	9,635	220,554
Unrealized Losses on Securities Held-to-Maturity, Less than 12 months	337	10,612
Unrealized Losses on Securities Held-to-Maturity, Total	337	10,612
No. of Issuances of Securities Held-to-Maturity, Less than 12 months	1	125
No. of Issuances of Securities Held-to-Maturity, Total	1	125
Fair Value of Securities Available-for-Sale, Less than 12 months	243,795	1,023,959
Fair Value of Securities Available-for-Sale, 12 months or longer	180,347	11,286
Fair Value of Securities Available-for-Sale, Total	424,142	1,035,245
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	14,249	20,427
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	18,204	239
Unrealized Losses of Securities Available-for-Sale, Total	32,453	20,666
No. of Issuances of Securities Available-for-Sale, Less than 12 months	29	59
No. of Issuances of Securities Available-for-Sale, 12 months or longer	28	9
No. of Issuances of Securities Available-for-Sale, Total	57	68
Fair Value of Total investment securities, Less than 12 months	253,430	1,244,513
Fair Value of Total investment securities, 12 months or longer	180,347	11,286
Fair Value of Total investment securities	433,777	1,255,799
Unrealized Losses of Total investment securities, Less than 12 months	14,586	31,039
Unrealized Losses of Total investment securities, 12 months or longer	18,204	239
Unrealized Losses of Total investment securities	32,790	31,278
No. of Issuances of Total investment securities, Less than 12 months	30	184
No. of Issuances of Total investment securities, 12 months or longer	28	9
No. of Issuances of Total investment securities	58	193
U.S. Treasury Securities [Member]
Schedule of Investments [Line Items]
Fair Value of Securities Available-for-Sale, Less than 12 months		118,828
Fair Value of Securities Available-for-Sale, Total		118,828
Unrealized Losses of Securities Available-for-Sale, Less than 12 months		6,745
Unrealized Losses of Securities Available-for-Sale, Total		6,745
No. of Issuances of Securities Available-for-Sale, Less than 12 months		5
No. of Issuances of Securities Available-for-Sale, Total		5
U.S. Government Sponsored Entities [Member]
Schedule of Investments [Line Items]
Fair Value of Securities Available-for-Sale, Less than 12 months	49,993	578,118
Fair Value of Securities Available-for-Sale, Total	49,993	578,118
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	7	6,840
Unrealized Losses of Securities Available-for-Sale, Total	7	6,840
No. of Issuances of Securities Available-for-Sale, Less than 12 months	1	12
No. of Issuances of Securities Available-for-Sale, Total	1	12
State And Municipal Securities [Member]
Schedule of Investments [Line Items]
Fair Value of Securities Held-to-Maturity, Less than 12 months		121,161
Fair Value of Securities Held-to-Maturity, Total		121,161
Unrealized Losses on Securities Held-to-Maturity, Less than 12 months		8,946
Unrealized Losses on Securities Held-to-Maturity, Total		8,946
No. of Issuances of Securities Held-to-Maturity, Less than 12 months		122
No. of Issuances of Securities Held-to-Maturity, Total		122
Fair Value of Securities Available-for-Sale, Less than 12 months		1,718
Fair Value of Securities Available-for-Sale, Total		1,718
Unrealized Losses of Securities Available-for-Sale, Less than 12 months		157
Unrealized Losses of Securities Available-for-Sale, Total		157
No. of Issuances of Securities Available-for-Sale, Less than 12 months		2
No. of Issuances of Securities Available-for-Sale, Total		2
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Fair Value of Securities Held-to-Maturity, Less than 12 months	9,635	9,954
Fair Value of Securities Held-to-Maturity, Total	9,635	9,954
Unrealized Losses on Securities Held-to-Maturity, Less than 12 months	337	13
Unrealized Losses on Securities Held-to-Maturity, Total	337	13
No. of Issuances of Securities Held-to-Maturity, Less than 12 months	1	1
No. of Issuances of Securities Held-to-Maturity, Total	1	1
Fair Value of Securities Available-for-Sale, Less than 12 months	185,577	310,630
Fair Value of Securities Available-for-Sale, 12 months or longer	172,857
Fair Value of Securities Available-for-Sale, Total	358,434	310,630
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	14,201	6,438
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	17,528
Unrealized Losses of Securities Available-for-Sale, Total	31,729	6,438
No. of Issuances of Securities Available-for-Sale, Less than 12 months	17	30
No. of Issuances of Securities Available-for-Sale, 12 months or longer	19
No. of Issuances of Securities Available-for-Sale, Total	36	30
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Fair Value of Securities Held-to-Maturity, Less than 12 months		89,439
Fair Value of Securities Held-to-Maturity, Total		89,439
Unrealized Losses on Securities Held-to-Maturity, Less than 12 months		1,653
Unrealized Losses on Securities Held-to-Maturity, Total		1,653
No. of Issuances of Securities Held-to-Maturity, Less than 12 months		2
No. of Issuances of Securities Held-to-Maturity, Total		2
Fair Value of Securities Available-for-Sale, Less than 12 months	564	354
Fair Value of Securities Available-for-Sale, 12 months or longer	35	32
Fair Value of Securities Available-for-Sale, Total	599	386
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	4	4
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	1	1
Unrealized Losses of Securities Available-for-Sale, Total	5	5
No. of Issuances of Securities Available-for-Sale, Less than 12 months	8	7
No. of Issuances of Securities Available-for-Sale, 12 months or longer	2	1
No. of Issuances of Securities Available-for-Sale, Total	10	8
Mortgage-Backed Securities-Non-Agency [Member]
Schedule of Investments [Line Items]
Fair Value of Securities Available-for-Sale, 12 months or longer	6,719	10,127
Fair Value of Securities Available-for-Sale, Total	6,719	10,127
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	431	118
Unrealized Losses of Securities Available-for-Sale, Total	431	118
No. of Issuances of Securities Available-for-Sale, 12 months or longer	2	3
No. of Issuances of Securities Available-for-Sale, Total	2	3
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Fair Value of Securities Available-for-Sale, 12 months or longer	570	887
Fair Value of Securities Available-for-Sale, Total	570	887
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	238	115
Unrealized Losses of Securities Available-for-Sale, Total	238	115
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]
Schedule of Investments [Line Items]
Fair Value of Securities Available-for-Sale, 12 months or longer	166	240
Fair Value of Securities Available-for-Sale, Total	166	240
Unrealized Losses of Securities Available-for-Sale, 12 months or longer	6	5
Unrealized Losses of Securities Available-for-Sale, Total	6	5
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
Mutual Funds [Member]
Schedule of Investments [Line Items]
Fair Value of Securities Available-for-Sale, Less than 12 months	1,987	3,927
Fair Value of Securities Available-for-Sale, Total	1,987	3,927
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	13	73
Unrealized Losses of Securities Available-for-Sale, Total	13	73
No. of Issuances of Securities Available-for-Sale, Less than 12 months	1	1
No. of Issuances of Securities Available-for-Sale, Total	1	1
Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Fair Value of Securities Available-for-Sale, Less than 12 months	5,674	10,384
Fair Value of Securities Available-for-Sale, Total	5,674	10,384
Unrealized Losses of Securities Available-for-Sale, Less than 12 months	24	170
Unrealized Losses of Securities Available-for-Sale, Total	$ 24	$ 170
No. of Issuances of Securities Available-for-Sale, Less than 12 months	2	2
No. of Issuances of Securities Available-for-Sale, Total	2	2