Loans And Allowance For Credit Losses (Summary Of Information On Impaired Loans) (Details) - Financial Receivables [Domain] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	$ 2,348,327		$ 2,348,327		$ 2,321,150
Unpaid principal balance	720,841		720,841		777,333
Recorded investment	606,481		606,481		628,728
Impaired Financing Receivable, Related Allowance	50,166		50,166		42,354
Average recorded investment	602,095	$ 863,084	578,481	$ 877,419
Interest income recognized	13,911	18,098	25,982	44,419
Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	212,734		212,734		185,520
Recorded investment	181,867		181,867		146,822
Impaired Financing Receivable, Related Allowance	31,670		31,670		22,852
Average recorded investment	174,911	194,683	155,584	188,136
Interest income recognized	2,831	4,212	4,255	6,802
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	164,116		164,116		198,231
Recorded investment	143,730		143,730		169,561
Impaired Financing Receivable, Related Allowance	4,804		4,804		6,087
Average recorded investment	144,613	232,662	142,817	236,250
Interest income recognized	3,186	4,532	6,970	9,286
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,471		1,471		1,535
Recorded investment	992		992		1,056
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	1,008	9,270	1,021	9,615
Interest income recognized	0	0	0	0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	378,321		378,321		385,286
Recorded investment	326,589		326,589		317,439
Impaired Financing Receivable, Related Allowance	36,474		36,474		28,939
Average recorded investment	320,532	436,615	299,422	434,001
Interest income recognized	6,017	8,744	11,225	16,088
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	50,251		50,251		60,993
Recorded investment	33,879		33,879		43,477
Impaired Financing Receivable, Related Allowance	973		973		1,773
Average recorded investment	35,562	61,957	36,215	64,265
Interest income recognized	1,628	1,394	2,177	4,932
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	174,299		174,299		203,788
Recorded investment	146,067		146,067		160,091
Impaired Financing Receivable, Related Allowance	2,127		2,127		2,345
Average recorded investment	144,054	245,827	142,439	260,749
Interest income recognized	5,063	6,618	10,038	20,568
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	224,550		224,550		264,781
Recorded investment	179,946		179,946		203,568
Impaired Financing Receivable, Related Allowance	3,100		3,100		4,118
Average recorded investment	179,616	307,784	178,654	325,014
Interest income recognized	6,691	8,012	12,215	25,500
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	29,015		29,015		30,209
Recorded investment	25,751		25,751		26,681
Impaired Financing Receivable, Related Allowance	497		497		437
Average recorded investment	25,400	25,854	24,948	25,470
Interest income recognized	416	372	821	774
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,348,327		2,348,327		2,321,150
Unpaid principal balance	4,673		4,673		6,580
Recorded investment	3,751		3,751		5,254
Impaired Financing Receivable, Related Allowance	173		173		133
Average recorded investment	4,176	7,314	4,463	7,854
Interest income recognized	230	421	516	930
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	81,050		81,050		86,575
Recorded investment	68,105		68,105		72,927
Impaired Financing Receivable, Related Allowance	9,732		9,732		8,494
Average recorded investment	69,874	82,353	68,464	81,909
Interest income recognized	534	512	1,041	1,052
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,232		3,232		3,902
Recorded investment	2,339		2,339		2,859
Impaired Financing Receivable, Related Allowance	190		190		233
Average recorded investment	2,497	3,164	2,529	3,166
Interest income recognized	22	36	64	74
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	0		0		0
Recorded investment	0		0		0
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	0	0	1	5
Interest income recognized	1	1	100	1
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	117,970		117,970		127,266
Recorded investment	99,946		99,946		107,721
Impaired Financing Receivable, Related Allowance	10,592		10,592		9,297
Average recorded investment	101,947	118,685	100,405	118,404
Interest income recognized	1,203	$ 1,342	2,542	$ 2,831
Impaired Financing Receivable Related Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	321,780		321,780		335,042
Impaired Financing Receivable Related Allowance [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	142,328		142,328		103,565
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	53,931		53,931		86,382
Impaired Financing Receivable Related Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0		0
Impaired Financing Receivable Related Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	196,259		196,259		189,947
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	24,579		24,579		26,977
Impaired Financing Receivable Related Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	46,443		46,443		63,740
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	71,022		71,022		90,717
Impaired Financing Receivable Related Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	10,361		10,361		11,883
Impaired Financing Receivable Related Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	3,751		3,751		5,254
Impaired Financing Receivable Related Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	39,264		39,264		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	1,123		1,123		1,410
Impaired Financing Receivable Related Allowance [Member] | Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0		0
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	54,499		54,499		54,378
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	284,701		284,701		293,686
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	39,539		39,539		43,257
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	89,799		89,799		83,179
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	992		992		1,056
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	130,330		130,330		127,492
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	9,300		9,300		16,500
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	99,624		99,624		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	108,924		108,924		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	15,390		15,390		14,798
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0		0
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	28,841		28,841		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	1,216		1,216		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		0
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	$ 45,447		$ 45,447		$ 53,343