Investment Securities (Amortized Cost, Unrealized Gains And Losses, And Fair Value Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	$ 1,799,178	$ 2,584,464
Available-for-sale Securities, Unrealized Gains	23,195	47,390
Available-for-sale Securities, Unrealized Losses	(31,395)	(6,625)
Available for sale, at fair value	1,790,978	2,625,229
Held to maturity, at amortized cost	5,563	4,541
Held-to-maturity Securities, Unrecognized Gains	330	198
Held-to-maturity Securities, Unrecognized Losses	(19)	(7)
Held-to-maturity Securities, Fair Value	5,874	4,732
U.S. Treasury And Agencies [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	249	45,503
Available-for-sale Securities, Unrealized Gains	20	318
Available-for-sale Securities, Unrealized Losses	(1)	(1)
Available for sale, at fair value	268	45,820
Obligations Of States And Political Subdivisions [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	229,969	245,606
Available-for-sale Securities, Unrealized Gains	7,811	18,119
Available-for-sale Securities, Unrealized Losses	(2,575)	0
Available for sale, at fair value	235,205	263,725
Held to maturity, at amortized cost		595
Held-to-maturity Securities, Unrecognized Gains		1
Held-to-maturity Securities, Unrecognized Losses		0
Held-to-maturity Securities, Fair Value		596
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	1,567,001	2,291,253
Available-for-sale Securities, Unrealized Gains	15,359	28,747
Available-for-sale Securities, Unrealized Losses	(28,819)	(6,624)
Available for sale, at fair value	1,553,541	2,313,376
Held to maturity, at amortized cost	5,563	3,946
Held-to-maturity Securities, Unrecognized Gains	330	197
Held-to-maturity Securities, Unrecognized Losses	(19)	(7)
Held-to-maturity Securities, Fair Value	5,874	4,136
Other Debt Securities [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost		143
Available-for-sale Securities, Unrealized Gains		79
Available-for-sale Securities, Unrealized Losses		0
Available for sale, at fair value	0	222
Investments In Mutual Funds And Other Equity Securities [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	1,959	1,959
Available-for-sale Securities, Unrealized Gains	5	127
Available-for-sale Securities, Unrealized Losses	0	0
Available for sale, at fair value	$ 1,964	$ 2,086