Loans And Allowance For Credit Losses (Summary Of Information On Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	$ 2,432,632		$ 2,416,357
Unpaid principal balance	841,333		687,148
Recorded investment	729,840		566,599
Impaired Financing Receivable, Related Allowance	85,884		48,697
Average recorded investment	618,858	$ 620,253
Interest income recognized	8,908	12,470
Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	457,773		272,161
Recorded investment	398,189		207,919
Impaired Financing Receivable, Related Allowance	71,962		30,538
Average recorded investment	281,841	160,013
Interest income recognized	1,472	1,451
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	124,637		141,526
Recorded investment	113,936		126,267
Impaired Financing Receivable, Related Allowance	4,162		5,486
Average recorded investment	122,241	177,568
Interest income recognized	2,431	4,092
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,405		1,430
Recorded investment	926		951
Impaired Financing Receivable, Related Allowance	0		0
Average recorded investment	932	1,033
Interest income recognized	0	0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	583,815		415,117
Recorded investment	513,051		335,137
Impaired Financing Receivable, Related Allowance	76,124		36,024
Average recorded investment	405,014	338,614
Interest income recognized	3,903	5,543
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	22,202		22,791
Recorded investment	14,125		14,634
Impaired Financing Receivable, Related Allowance	883		618
Average recorded investment	14,293	38,736
Interest income recognized	513	569
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	134,297		142,239
Recorded investment	108,070		117,225
Impaired Financing Receivable, Related Allowance	1,706		2,604
Average recorded investment	106,236	143,496
Interest income recognized	3,458	5,008
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	156,499		165,030
Recorded investment	122,195		131,859
Impaired Financing Receivable, Related Allowance	2,589		3,222
Average recorded investment	120,529	182,232
Interest income recognized	3,971	5,577
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	28,148		27,064
Recorded investment	25,423		24,299
Impaired Financing Receivable, Related Allowance	145		243
Average recorded investment	24,730	25,386
Interest income recognized	386	413
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,432,632		2,416,357
Unpaid principal balance	2,565		3,187
Recorded investment	1,935		2,606
Impaired Financing Receivable, Related Allowance	53		299
Average recorded investment	2,502	4,748
Interest income recognized	107	285
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	66,860		74,009
Recorded investment	64,372		70,695
Impaired Financing Receivable, Related Allowance	6,805		8,736
Average recorded investment	63,166	66,711
Interest income recognized	477	510
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,446		2,741
Recorded investment	2,864		2,003
Impaired Financing Receivable, Related Allowance	168		173
Average recorded investment	2,917	2,560
Interest income recognized	48	42
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average recorded investment	0	2
Interest income recognized	16	100
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	101,019		107,001
Recorded investment	94,594		99,603
Impaired Financing Receivable, Related Allowance	7,171		9,451
Average recorded investment	93,315	99,407
Interest income recognized	1,034	$ 1,350
Impaired Financing Receivable Related Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	444,964		300,949
Impaired Financing Receivable Related Allowance [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	329,801		163,729
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	39,778		43,243
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	369,579		206,972
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	9,319		9,558
Impaired Financing Receivable Related Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	26,275		34,361
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	35,594		43,919
Impaired Financing Receivable Related Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	4,295		5,319
Impaired Financing Receivable Related Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	1,900		2,570
Impaired Financing Receivable Related Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	31,720		41,155
Impaired Financing Receivable Related Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	1,876		1,014
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	39,791		50,058
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	284,876		265,650
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	68,388		44,190
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	74,158		83,024
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	926		951
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	143,472		128,165
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	4,806		5,076
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	81,795		82,864
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	86,601		87,940
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	21,128		18,980
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	35		36
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	32,652		29,540
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	988		989
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	$ 54,803		$ 49,545