Loans (Information By Class Related To Individually Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	$ 254,831		$ 254,831		$ 298,778
Unpaid Principal Balance	292,555		292,555		336,303
Related Allowance	43,804		43,804		45,818
Average balance of impaired loans	260,083	$ 312,649	275,227	$ 313,034
Interest income recognized on impaired loan	1,692	1,760	5,104	4,898
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	34,348		34,348		51,086
Unpaid Principal Balance	44,602		44,602		58,776
Related Allowance	7,021		7,021		4,413
Average balance of impaired loans	37,704	56,199	43,946	53,084
Interest income recognized on impaired loan	204	309	646	740
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	220,483		220,483		247,692
Unpaid Principal Balance	247,953		247,953		277,527
Related Allowance	36,783		36,783		41,405
Average balance of impaired loans	222,379	256,450	231,281	259,950
Interest income recognized on impaired loan	1,488	1,451	4,458	4,158
Impaired Loans With No Related Allowance Recorded | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	2,055		2,055		10,419
Unpaid Principal Balance	10,769		10,769		16,636
Related Allowance	0		0		0
Average balance of impaired loans	5,771	14,942	8,706	14,145
Interest income recognized on impaired loan	0	0	0	0
Impaired Loans With No Related Allowance Recorded | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	20,425		20,425		20,651
Unpaid Principal Balance	33,111		33,111		34,553
Related Allowance	0		0		0
Average balance of impaired loans	20,100	19,711	20,251	19,725
Interest income recognized on impaired loan	0	0	0	0
Impaired Loans With Related Allowance Recorded | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	32,293		32,293		40,667
Unpaid Principal Balance	33,833		33,833		42,140
Related Allowance	7,021		7,021		4,413
Average balance of impaired loans	31,933	41,257	35,240	38,939
Interest income recognized on impaired loan	204	309	646	740
Impaired Loans With Related Allowance Recorded | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	200,058		200,058		227,041
Unpaid Principal Balance	214,842		214,842		242,974
Related Allowance	36,783		36,783		41,405
Average balance of impaired loans	202,279	236,739	211,030	240,225
Interest income recognized on impaired loan	1,488	1,451	4,458	4,158
General C I | Impaired Loans With No Related Allowance Recorded | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	2,055		2,055		10,419
Unpaid Principal Balance	10,769		10,769		16,636
Related Allowance	0		0		0
Average balance of impaired loans	5,771	13,708	8,706	12,088
Interest income recognized on impaired loan	0	0	0	0
General C I | Impaired Loans With Related Allowance Recorded | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	26,876		26,876		34,334
Unpaid Principal Balance	27,345		27,345		34,470
Related Allowance	5,970		5,970		3,294
Average balance of impaired loans	26,144	33,433	29,136	29,896
Interest income recognized on impaired loan	193	289	597	668
TRUPs | Impaired Loans With Related Allowance Recorded | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	3,097		3,097		3,209
Unpaid Principal Balance	3,700		3,700		3,700
Related Allowance	925		925		925
Average balance of impaired loans	3,117	3,258	3,157	3,291
Interest income recognized on impaired loan	0	0	0	0
Income C R E | Impaired Loans With No Related Allowance Recorded | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average balance of impaired loans	0	1,234	0	2,057
Interest income recognized on impaired loan	0	0	0	0
Income C R E | Impaired Loans With Related Allowance Recorded | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	1,525		1,525		1,831
Unpaid Principal Balance	1,525		1,525		2,209
Related Allowance	43		43		62
Average balance of impaired loans	1,628	3,211	1,737	4,376
Interest income recognized on impaired loan	11	15	39	55
Residential C R E | Impaired Loans With Related Allowance Recorded | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	795		795		1,293
Unpaid Principal Balance	1,263		1,263		1,761
Related Allowance	83		83		132
Average balance of impaired loans	1,044	1,355	1,210	1,376
Interest income recognized on impaired loan	0	5	10	17
Home Equity Line of Credit | Impaired Loans With No Related Allowance Recorded | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	10,513		10,513		11,383
Unpaid Principal Balance	20,372		20,372		21,662
Related Allowance	0		0		0
Average balance of impaired loans	10,225	11,273	10,536	11,100
Interest income recognized on impaired loan	0	0	0	0
Home Equity Line of Credit | Impaired Loans With Related Allowance Recorded | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	74,009		74,009		84,711
Unpaid Principal Balance	76,587		76,587		87,126
Related Allowance	14,174		14,174		15,927
Average balance of impaired loans	74,894	87,919	78,859	88,266
Interest income recognized on impaired loan	554	546	1,695	1,527
R E Installment Loans | Impaired Loans With No Related Allowance Recorded | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	4,431		4,431		3,957
Unpaid Principal Balance	5,135		5,135		4,992
Related Allowance	0		0		0
Average balance of impaired loans	4,182	4,158	4,014	4,333
Interest income recognized on impaired loan	0	0	0	0
R E Installment Loans | Impaired Loans With Related Allowance Recorded | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	46,905		46,905		53,409
Unpaid Principal Balance	47,708		47,708		54,559
Related Allowance	9,762		9,762		12,875
Average balance of impaired loans	47,628	57,775	49,634	58,890
Interest income recognized on impaired loan	315	357	950	1,019
Permanent Mortgage Portfolio Segment | Impaired Loans With No Related Allowance Recorded | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	5,481		5,481		5,311
Unpaid Principal Balance	7,604		7,604		7,899
Related Allowance	0		0		0
Average balance of impaired loans	5,693	4,280	5,701	4,292
Interest income recognized on impaired loan	0	0	0	0
Permanent Mortgage Portfolio Segment | Impaired Loans With Related Allowance Recorded | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	78,600		78,600		88,615
Unpaid Principal Balance	90,003		90,003		100,983
Related Allowance	12,601		12,601		12,470
Average balance of impaired loans	79,305	90,697	82,186	92,716
Interest income recognized on impaired loan	616	544	1,805	1,602
Credit Card And Other Portfolio Segment | Impaired Loans With Related Allowance Recorded | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	544		544		306
Unpaid Principal Balance	544		544		306
Related Allowance	246		246		$ 133
Average balance of impaired loans	452	348	351	353
Interest income recognized on impaired loan	$ 3	$ 4	$ 8	$ 10