Loans And Allowance For Credit Losses (Summary Of Information On Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	$ 2,314,806		$ 2,321,150
Unpaid principal balance	783,075		777,333
Recorded investment	644,154		628,728
Impaired Financing Receivable, Related Allowance	52,439		42,354
Average recorded investment	620,253	907,227
Interest income recognized	12,470	26,545
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	223,938		185,520
Recorded investment	181,613		146,822
Impaired Financing Receivable, Related Allowance	30,899		22,852
Average recorded investment	160,013	188,191
Interest income recognized	1,451	2,591
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	202,999		198,231
Recorded investment	176,075		169,561
Impaired Financing Receivable, Related Allowance	7,341		6,087
Average recorded investment	177,568	237,902
Interest income recognized	4,092	4,758
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,505		1,535
Recorded investment	1,027		1,056
Impaired Financing Receivable, Related Allowance	0		0
Average recorded investment	1,033	0
Interest income recognized	0	0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	428,442		385,286
Recorded investment	358,715		317,439
Impaired Financing Receivable, Related Allowance	38,240		28,939
Average recorded investment	338,614	426,093
Interest income recognized	5,543	7,349
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	55,316		60,993
Recorded investment	38,462		43,477
Impaired Financing Receivable, Related Allowance	1,293		1,773
Average recorded investment	38,736	66,772
Interest income recognized	569	3,538
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	180,822		203,788
Recorded investment	146,931		160,091
Impaired Financing Receivable, Related Allowance	3,550		2,345
Average recorded investment	143,496	293,802
Interest income recognized	5,008	14,183
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	236,138		264,781
Recorded investment	185,393		203,568
Impaired Financing Receivable, Related Allowance	4,843		4,118
Average recorded investment	182,232	360,574
Interest income recognized	5,577	17,721
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	29,149		30,209
Recorded investment	25,779		26,681
Impaired Financing Receivable, Related Allowance	189		437
Average recorded investment	25,386	25,224
Interest income recognized	413	402
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,314,806		2,321,150
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	80,023		86,575
Recorded investment	67,037		72,927
Impaired Financing Receivable, Related Allowance	8,885		8,494
Average recorded investment	66,711	83,241
Interest income recognized	510	540
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,498		3,902
Recorded investment	2,556		2,859
Impaired Financing Receivable, Related Allowance	187		233
Average recorded investment	2,560	3,490
Interest income recognized	42	38
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	0		0
Recorded investment	0		0
Impaired Financing Receivable, Related Allowance	0		0
Average recorded investment	2	10
Interest income recognized	100	1
Consumer Other Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	5,825		6,580
Recorded investment	4,674		5,254
Impaired Financing Receivable, Related Allowance	95		133
Average recorded investment	4,748	8,595
Interest income recognized	285	494
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	118,495		127,266
Recorded investment	100,046		107,721
Impaired Financing Receivable, Related Allowance	9,356		9,297
Average recorded investment	99,407	120,560
Interest income recognized	1,350	1,475
Impaired Financing Receivable Related Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	330,773		335,042
Impaired Financing Receivable Related Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	147,353		103,565
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	73,403		86,382
Impaired Financing Receivable Related Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0
Impaired Financing Receivable Related Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	220,756		189,947
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	25,897		26,977
Impaired Financing Receivable Related Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	30,231		63,740
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	56,128		90,717
Impaired Financing Receivable Related Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	11,288		11,883
Impaired Financing Receivable Related Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	36,681		35,831
Impaired Financing Receivable Related Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	1,246		1,410
Impaired Financing Receivable Related Allowance [Member] | Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0
Impaired Financing Receivable Related Allowance [Member] | Consumer Other Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	4,674		5,254
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	53,889		54,378
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	313,381		293,686
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	34,260		43,257
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	102,672		83,179
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	1,027		1,056
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	137,959		127,492
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	12,565		16,500
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	116,700		96,351
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	129,265		112,851
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	14,491		14,798
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	30,356		37,096
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	1,310		1,449
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Other Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	46,157		53,343
Nonaccruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity			$ 1,022