Investment Securities (Amortized Cost, Unrealized Gains And Losses, And Fair Value Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	$ 2,568,228	$ 1,799,178
Available-for-sale Securities, Unrealized Gains	36,442	23,195
Available-for-sale Securities, Unrealized Losses	(15,701)	(31,395)
Available for sale, at fair value	2,588,969	1,790,978
Held to maturity, at amortized cost	5,519	5,563
Held-to-maturity Securities, Unrealized Gains	306	330
Held-to-maturity Securities, Unrealized Losses	(42)	(19)
Held-to-maturity Securities, Fair Value	5,783	5,874
U.S. Treasury And Agencies [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	214	249
Available-for-sale Securities, Unrealized Gains	19	20
Available-for-sale Securities, Unrealized Losses	0	(1)
Available for sale, at fair value	233	268
Obligations Of States And Political Subdivisions [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	336,607	229,969
Available-for-sale Securities, Unrealized Gains	13,428	7,811
Available-for-sale Securities, Unrealized Losses	(1,056)	(2,575)
Available for sale, at fair value	348,979	235,205
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	2,229,391	1,567,001
Available-for-sale Securities, Unrealized Gains	22,995	15,359
Available-for-sale Securities, Unrealized Losses	(14,645)	(28,819)
Available for sale, at fair value	2,237,741	1,553,541
Held to maturity, at amortized cost	5,375	5,563
Held-to-maturity Securities, Unrealized Gains	306	330
Held-to-maturity Securities, Unrealized Losses	(42)	(19)
Held-to-maturity Securities, Fair Value	5,639	5,874
Investments In Mutual Funds And Other Equity Securities [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	2,016	1,959
Available-for-sale Securities, Unrealized Gains	0	5
Available-for-sale Securities, Unrealized Losses	0	0
Available for sale, at fair value	2,016	1,964
Other Investments Securities [Member]
Investment Holdings [Line Items]
Held to maturity, at amortized cost	144
Held-to-maturity Securities, Unrealized Gains	0
Held-to-maturity Securities, Unrealized Losses	0
Held-to-maturity Securities, Fair Value	$ 144