Investment Securities (Investment Securities With Unrealized Losses By Aggregated Major Security Type And Length Of Time In A Continuous Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$ 291,425	$ 97,801
Available-for-Sale, Less than 12 Months, Unrealized Losses	(5,309)	(734)
Available-for-Sale, 12 months or longer, Fair Value	39,286	74,096
Available-for-Sale, 12 months or longer, Unrealized Losses	(19,907)	(24,858)
Available-for-Sale, Fair Value	330,711	171,897
Available-for-Sale, Unrealized Losses	(25,216)	(25,592)
Held-to-Maturity, Less than 12 Months, Fair Value	3,618	1,635
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(63)	(3)
Held-to-Maturity, 12 months or longer, Fair Value	52	13,180
Held-to-Maturity, 12 months or longer, Unrealized Losses	0	(175)
Held-to-maturity, Fair Value	3,670	14,815
Held-to-Maturity, Unrealized Losses	(63)	(178)
U.S. Government-Sponsored Entities And Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	155,753	24,935
Available-for-Sale, Less than 12 Months, Unrealized Losses	(1,909)	(65)
Available-for-Sale, 12 months or longer, Fair Value	0	0
Available-for-Sale, 12 months or longer, Unrealized Losses	0	0
Available-for-Sale, Fair Value	155,753	24,935
Available-for-Sale, Unrealized Losses	(1,909)	(65)
Mortgage-Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	63,492	49,016
Available-for-Sale, Less than 12 Months, Unrealized Losses	(113)	(61)
Available-for-Sale, 12 months or longer, Fair Value	0	3
Available-for-Sale, 12 months or longer, Unrealized Losses	0	0
Available-for-Sale, Fair Value	63,492	49,019
Available-for-Sale, Unrealized Losses	(113)	(61)
Mortgage-Backed Securities - Non-Agency [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	26,983	10,053
Available-for-Sale, Less than 12 Months, Unrealized Losses	(1,714)	(353)
Available-for-Sale, 12 months or longer, Fair Value	23,867	59,203
Available-for-Sale, 12 months or longer, Unrealized Losses	(401)	(4,520)
Available-for-Sale, Fair Value	50,850	69,256
Available-for-Sale, Unrealized Losses	(2,115)	(4,873)
States And Political Subdivisions [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	41,115	9,281
Available-for-Sale, Less than 12 Months, Unrealized Losses	(1,541)	(114)
Available-for-Sale, 12 months or longer, Fair Value	1,349	1,345
Available-for-Sale, 12 months or longer, Unrealized Losses	(35)	(79)
Available-for-Sale, Fair Value	42,464	10,626
Available-for-Sale, Unrealized Losses	(1,576)	(193)
Held-to-Maturity, Less than 12 Months, Fair Value	3,618	1,613
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(63)	(1)
Held-to-Maturity, 12 months or longer, Fair Value	52	13,180
Held-to-Maturity, 12 months or longer, Unrealized Losses	0	(175)
Held-to-maturity, Fair Value	3,670	14,793
Held-to-Maturity, Unrealized Losses	(63)	(176)
Pooled Trust Preferred Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	0	0
Available-for-Sale, Less than 12 Months, Unrealized Losses	0	0
Available-for-Sale, 12 months or longer, Fair Value	7,797	7,327
Available-for-Sale, 12 months or longer, Unrealized Losses	(17,668)	(18,134)
Available-for-Sale, Fair Value	7,797	7,327
Available-for-Sale, Unrealized Losses	(17,668)	(18,134)
Other Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	4,082	4,516
Available-for-Sale, Less than 12 Months, Unrealized Losses	(32)	(141)
Available-for-Sale, 12 months or longer, Fair Value	6,273	6,218
Available-for-Sale, 12 months or longer, Unrealized Losses	(1,803)	(2,125)
Available-for-Sale, Fair Value	10,355	10,734
Available-for-Sale, Unrealized Losses	(1,835)	(2,266)
Held-to-Maturity, Less than 12 Months, Fair Value		22
Held-to-Maturity, Less than 12 Months, Unrealized Losses		(2)
Held-to-Maturity, 12 months or longer, Fair Value		0
Held-to-Maturity, 12 months or longer, Unrealized Losses		0
Held-to-maturity, Fair Value		22
Held-to-Maturity, Unrealized Losses		$ (2)