Loans And Allowance For Credit Losses (Summary Of Information On Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	$ 2,581,068		$ 2,581,068		$ 2,416,357
Unpaid principal balance	781,102		781,102		687,148
Recorded investment	695,138		695,138		566,599
Impaired Financing Receivable, Related Allowance	76,704		76,704		48,697
Average recorded investment	723,717	$ 602,925	599,245	$ 573,862
Interest income recognized	7,985	9,279	25,742	35,198
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	18,935		18,935		0
Recorded investment	15,996		15,996		0
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	18,561	0	20,583	0
Interest income recognized	0	0	0	0
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	108,694		108,694		141,526
Recorded investment	99,957		99,957		126,267
Impaired Financing Receivable, Related Allowance	3,612		3,612		5,486
Average recorded investment	100,386	138,194	103,439	135,212
Interest income recognized	2,060	2,752	7,537	9,706
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,347		1,347		1,430
Recorded investment	869		869		951
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	877	978	903	1,007
Interest income recognized	0	0	0	0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	586,316		586,316		415,117
Recorded investment	526,484		526,484		335,137
Impaired Financing Receivable, Related Allowance	67,993		67,993		36,024
Average recorded investment	549,853	330,814	422,776	295,044
Interest income recognized	3,524	4,066	11,514	15,231
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	18,432		18,432		22,791
Recorded investment	10,861		10,861		14,634
Impaired Financing Receivable, Related Allowance	256		256		618
Average recorded investment	11,281	31,506	12,041	31,920
Interest income recognized	863	499	2,065	2,691
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	86,540		86,540		142,239
Recorded investment	74,585		74,585		117,225
Impaired Financing Receivable, Related Allowance	1,322		1,322		2,604
Average recorded investment	73,860	119,694	79,449	124,446
Interest income recognized	2,689	3,705	9,378	13,383
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	104,972		104,972		165,030
Recorded investment	85,446		85,446		131,859
Impaired Financing Receivable, Related Allowance	1,578		1,578		3,222
Average recorded investment	85,141	151,200	91,490	156,366
Interest income recognized	3,552	4,204	11,443	16,074
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	25,200		25,200		27,064
Recorded investment	22,653		22,653		24,299
Impaired Financing Receivable, Related Allowance	537		537		243
Average recorded investment	22,895	25,095	22,291	24,329
Interest income recognized	323	401	1,029	1,206
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,581,068		2,581,068		2,416,357
Unpaid principal balance	1,992		1,992		3,187
Recorded investment	1,516		1,516		2,606
Impaired Financing Receivable, Related Allowance	3		3		299
Average recorded investment	1,912	36	2,166	4,109
Interest income recognized	81	177	281	692
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	59,306		59,306		74,009
Recorded investment	56,297		56,297		70,695
Impaired Financing Receivable, Related Allowance	6,488		6,488		8,736
Average recorded investment	61,149	90,240	57,815	91,671
Interest income recognized	461	398	1,324	1,803
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,316		3,316		2,741
Recorded investment	2,742		2,742		2,003
Impaired Financing Receivable, Related Allowance	105		105		173
Average recorded investment	2,767	5,540	2,707	2,342
Interest income recognized	43	32	134	91
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average recorded investment	0	0	0	1
Interest income recognized	1	1	17	101
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	89,814		89,814		107,001
Recorded investment	83,208		83,208		99,603
Impaired Financing Receivable, Related Allowance	7,133		7,133		9,451
Average recorded investment	88,723	120,911	84,979	122,452
Interest income recognized	909	1,009	2,785	3,893
Impaired Financing Receivable Related Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	444,399		444,399		300,949
Impaired Financing Receivable Related Allowance [Member] | loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0		0
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	38,163		38,163		43,243
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	376,917		376,917		206,972
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	7,323		7,323		9,558
Impaired Financing Receivable Related Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	22,290		22,290		34,361
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	29,613		29,613		43,919
Impaired Financing Receivable Related Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	6,762		6,762		5,319
Impaired Financing Receivable Related Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	32		32		2,570
Impaired Financing Receivable Related Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	29,250		29,250		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	1,825		1,825		1,014
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	37,869		37,869		50,058
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	250,739		250,739		265,650
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	15,996		15,996		0
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	61,794		61,794		83,024
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	869		869		951
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	149,567		149,567		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	3,538		3,538		5,076
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	52,295		52,295		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	55,833		55,833		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	15,891		15,891		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	1,484		1,484		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	27,047		27,047		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	917		917		989
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	45,339		45,339		49,545
Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	476,275		476,275		272,161
Recorded investment	425,658		425,658		207,919
Impaired Financing Receivable, Related Allowance	64,381		64,381		30,538
Average recorded investment	448,590	191,642	318,434	158,825
Interest income recognized	1,464	$ 1,314	3,977	$ 5,525
Commercial and Industrial Sector [Member] | Impaired Financing Receivable Related Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	338,754		338,754		163,729
Commercial and Industrial Sector [Member] | Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	$ 86,904		$ 86,904		$ 44,190