Investment Securities (Summary Of Realized Gains And Losses And Recognition Of OTTI) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Investments [Line Items]
Sale Proceeds	$ 278,757	$ 416,474	$ 433,248
Gains	7,166	10,681	7,855
Losses	(3,343)	(933)	(21,665)
OTTI Charges		(5,838)	(28,477)
Net	3,823	3,910	(42,287)
Agency Notes - GSE [Member]
Schedule of Investments [Line Items]
Sale Proceeds		30,027
Gains		18
Net		18
Agency CMOs - GSE [Member]
Schedule of Investments [Line Items]
Sale Proceeds	94,335	116,140
Gains	1,959	1,980
Net	1,959	1,980
Pooled Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Sale Proceeds	1,456	4,153	958
Gains		341	10
Losses	(3,343)	(933)	(17,695)
OTTI Charges		(5,771)	(24,933)
Net	(3,343)	(6,363)	(42,618)
Single Issuer Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Sale Proceeds			5,625
Gains			611
Net			611
Equity Securities - Financial Institutions [Member]
Schedule of Investments [Line Items]
Sale Proceeds	2,353		17,538
Gains	374		854
Losses			(3,970)
OTTI Charges		(67)	(3,544)
Net	374	(67)	(6,660)
Mortgage-Backed Securities- GSE [Member]
Schedule of Investments [Line Items]
Sale Proceeds	180,613	266,154	409,127
Gains	4,833	8,342	6,380
Net	$ 4,833	$ 8,342	$ 6,380