Investment Securities (Summary Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Investment [Line Items]
Held-to-maturity, fair value	$ 643,926	$ 609,547
Held-to-maturity, Amortized cost	655,746	630,574
Held To Maturity Securities Gross Unrealized Gains	0
Held To Maturity Securities Gross Unrealized Gains Losses 1		0
Held To Maturity Securities Gross Unrealized Losses	40,642
Held To Maturity Securities Gross Unrealized Losses 1		41,593
Held-to-maturity, Carrying value	615,104	588,981
Available-for-sale debt securities, Amortized cost	3,423,398
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	43,923
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	190,654
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	3,276,667
Available-for-sale debt securities, Estimated fair value	3,276,667	3,421,683
Available-for-sale Securities, Gross Unrealized Gain	43,983	48,345
Available-for-sale equity securities, Amortized cost		3,661,627
Gross Unrealized Gains on Debt Securities		48,324
Gross Unrealized Losses on AFS Debt Securities		288,268
Available-for-sale equity securities, Carrying value		3,421,683
Available-for-sale, Amortized cost	3,611,971	3,949,230
Available-for-sale, Gross unrealized losses, Recognized in OCI	193,145	295,689
Carrying value	3,462,809	3,701,886
Available-for-sale securities, Estimated fair value	3,462,809	3,701,886
Held-to-maturity Securities, Unrecognized Holding Gain	30,923	26,490
Held-to-maturity Securities, Unrecognized Holding Loss	2,101	5,924
amortized cost of investment securities	4,267,717	4,579,804
Gross Unrealized Gains of Investment Securities Recognized in OCI	43,983	48,345
Gross Unrealized Losses of Investment Securities Recognized in OCI	233,787	337,282
Carrying Value of Investment Securities	4,077,913	4,290,867
Estimated Fair Value of Investment Securities	4,106,735	4,311,433
Municipal Securities [Member]
Investment [Line Items]
Held-to-maturity, fair value	589,369	557,734
Held-to-maturity, Amortized cost	576,318	551,055
Held To Maturity Securities Gross Unrealized Gains	0
Held To Maturity Securities Gross Unrealized Gains Losses 1		0
Held To Maturity Securities Gross Unrealized Losses	0
Held To Maturity Securities Gross Unrealized Losses 1		0
Held-to-maturity, Carrying value	576,318	551,055
Available-for-sale debt securities, Amortized cost	187,760	65,425
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	1,256
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	607
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	188,409	66,264
Available-for-sale debt securities, Estimated fair value	188,409	66,264
Available-for-sale Securities, Gross Unrealized Gain		1,329
Available-for-sale, Gross unrealized losses, Recognized in OCI		490
Held-to-maturity Securities, Unrecognized Holding Gain	13,987	11,295
Held-to-maturity Securities, Unrecognized Holding Loss	936	4,616
Trust Preferred Securities - Banks And Insurance [Member] | Asset-Backed Securities [Member]
Investment [Line Items]
Held-to-maturity, fair value	54,457	51,713
Held-to-maturity, Amortized cost	79,328	79,419
Held To Maturity Securities Gross Unrealized Gains	0
Held To Maturity Securities Gross Unrealized Gains Losses 1		0
Held To Maturity Securities Gross Unrealized Losses	40,642
Held To Maturity Securities Gross Unrealized Losses 1		41,593
Held-to-maturity, Carrying value	38,686	37,826
Available-for-sale debt securities, Amortized cost	915,058
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	11,383
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	176,289
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	750,152
Available-for-sale debt securities, Estimated fair value	750,152
Available-for-sale Securities, Gross Unrealized Gain		13,439
Available-for-sale equity securities, Amortized cost		1,508,224
Available-for-sale equity securities, Carrying value		1,238,820
Available-for-sale, Gross unrealized losses, Recognized in OCI		282,843
Available-for-sale securities, Estimated fair value		1,238,820
Held-to-maturity Securities, Unrecognized Holding Gain	16,936	15,195
Held-to-maturity Securities, Unrecognized Holding Loss	1,165	1,308
Other [Member] | Asset-Backed Securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost	1,114
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	229
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	0
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	1,343
Available-for-sale debt securities, Estimated fair value	1,343
Available-for-sale Securities, Gross Unrealized Gain		359
Available-for-sale equity securities, Amortized cost		27,540
Available-for-sale equity securities, Carrying value		27,899
Available-for-sale, Gross unrealized losses, Recognized in OCI		0
Available-for-sale securities, Estimated fair value		27,899
Other Debt Securities [Member] | Asset-Backed Securities [Member]
Investment [Line Items]
Held-to-maturity, fair value	100	100
Held-to-maturity, Amortized cost	100	100
Held To Maturity Securities Gross Unrealized Gains	0
Held To Maturity Securities Gross Unrealized Gains Losses 1		0
Held To Maturity Securities Gross Unrealized Losses	0
Held To Maturity Securities Gross Unrealized Losses 1		0
Held-to-maturity, Carrying value	100	100
Held-to-maturity Securities, Unrecognized Holding Gain	0	0
Held-to-maturity Securities, Unrecognized Holding Loss	0	0
U.S. Treasury Securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost	1,499	1,442
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	46
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	0
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	1,545	1,546
Available-for-sale debt securities, Estimated fair value	1,545	1,546
Available-for-sale Securities, Gross Unrealized Gain		104
Available-for-sale, Gross unrealized losses, Recognized in OCI		0
Agency Securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost	604,263	517,905
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	2,509
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	6,452
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	600,320	518,924
Available-for-sale debt securities, Estimated fair value	600,320	518,924
Available-for-sale Securities, Gross Unrealized Gain		1,920
Available-for-sale, Gross unrealized losses, Recognized in OCI		901
Agency Guaranteed Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost	302,408	308,687
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	11,356
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	464
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	313,300	317,376
Available-for-sale debt securities, Estimated fair value	313,300	317,376
Available-for-sale Securities, Gross Unrealized Gain		9,926
Available-for-sale, Gross unrealized losses, Recognized in OCI		1,237
Small Business Administration Loan-Backed Securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost	1,404,788	1,202,901
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	17,045
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	6,813
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	1,415,020	1,221,259
Available-for-sale debt securities, Estimated fair value	1,415,020	1,221,259
Available-for-sale Securities, Gross Unrealized Gain		21,129
Available-for-sale, Gross unrealized losses, Recognized in OCI		2,771
Trust Preferred Securities - Real Estate Investment Trusts [Member] | Asset-Backed Securities [Member]
Investment [Line Items]
Available-for-sale Securities, Gross Unrealized Gain		0
Available-for-sale equity securities, Amortized cost		22,996
Available-for-sale equity securities, Carrying value		22,996
Available-for-sale, Gross unrealized losses, Recognized in OCI		0
Available-for-sale securities, Estimated fair value		22,996
Auction Rate Securities [Member] | Asset-Backed Securities [Member]
Investment [Line Items]
Available-for-sale debt securities, Amortized cost	6,508
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	99
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	29
Available-For-Sale Securities, Debt Securities, Net Carrying Amount	6,578
Available-for-sale debt securities, Estimated fair value	6,578
Available-for-sale Securities, Gross Unrealized Gain		118
Available-for-sale equity securities, Amortized cost		6,507
Available-for-sale equity securities, Carrying value		6,599
Available-for-sale, Gross unrealized losses, Recognized in OCI		26
Available-for-sale securities, Estimated fair value		6,599
Mutual Funds And Other [Member]
Investment [Line Items]
Available-for-sale Securities, Gross Unrealized Gain		21
Available-for-sale, Amortized cost		287,603
Available-for-sale, Gross unrealized losses, Recognized in OCI		7,421
Carrying value		280,203
Available-for-sale securities, Estimated fair value		280,203
Mutual Funds And Stock [Member]
Investment [Line Items]
Available-for-sale Securities, Gross Unrealized Gain	60
Available-for-sale, Amortized cost	188,573
Available-for-sale, Gross unrealized losses, Recognized in OCI	2,491
Carrying value	186,142
Available-for-sale securities, Estimated fair value	$ 186,142