Loans And Allowance for Credit Losses (Credit Quality Indicators Personal Banking Loan Portfolio) (Details) - Personal Banking Portfolio Segment [Member] $ in Thousands	Dec. 31, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 1,664,641
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	826,734
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	380,452
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	318,533
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	303,661
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	633,424
Financing Receivable, Revolving	1,608,397
Financing Receivable, before Allowance for Credit Loss	5,735,842
Real Estate - Personal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,124,481
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	488,945
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	218,787
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	202,427
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	227,718
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	546,196
Financing Receivable, Revolving	11,476
Financing Receivable, before Allowance for Credit Loss	2,820,030
Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	537,011
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	337,789
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	161,665
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	116,106
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	75,943
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	87,228
Financing Receivable, Revolving	634,760
Financing Receivable, before Allowance for Credit Loss	1,950,502
Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	307,083
Financing Receivable, before Allowance for Credit Loss	307,083
Consumer Credit Card [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	655,078
Financing Receivable, before Allowance for Credit Loss	655,078
Overdrafts [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	3,149
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	3,149
Current to 90 Days Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,663,866
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	825,810
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	379,727
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	317,857
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	303,034
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	630,839
Financing Receivable, Revolving	1,594,215
Financing Receivable, before Allowance for Credit Loss	5,715,348
Current to 90 Days Past Due [Member] \| Real Estate - Personal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,123,918
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	488,379
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	218,390
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	201,971
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	227,265
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	544,008
Financing Receivable, Revolving	11,476
Financing Receivable, before Allowance for Credit Loss	2,815,407
Current to 90 Days Past Due [Member] \| Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	536,799
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	337,431
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	161,337
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	115,886
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	75,769
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	86,831
Financing Receivable, Revolving	633,186
Financing Receivable, before Allowance for Credit Loss	1,947,239
Current to 90 Days Past Due [Member] \| Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	306,693
Financing Receivable, before Allowance for Credit Loss	306,693
Current to 90 Days Past Due [Member] \| Consumer Credit Card [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	642,860
Financing Receivable, before Allowance for Credit Loss	642,860
Current to 90 Days Past Due [Member] \| Overdrafts [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	3,149
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	3,149
Over 90 days past due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	746
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	733
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	609
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	631
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	562
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,245
Financing Receivable, Revolving	14,182
Financing Receivable, before Allowance for Credit Loss	18,708
Over 90 days past due [Member] \| Real Estate - Personal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	534
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	375
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	281
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	411
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	388
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	848
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	2,837
Over 90 days past due [Member] \| Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	212
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	358
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	328
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	220
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	174
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	397
Financing Receivable, Revolving	1,574
Financing Receivable, before Allowance for Credit Loss	3,263
Over 90 days past due [Member] \| Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	390
Financing Receivable, before Allowance for Credit Loss	390
Over 90 days past due [Member] \| Consumer Credit Card [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	12,218
Financing Receivable, before Allowance for Credit Loss	12,218
Non-Accrual [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	29
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	191
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	116
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	45
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	65
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,340
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	1,786
Non-Accrual [Member] \| Real Estate - Personal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	29
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	191
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	116
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	45
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	65
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,340
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss	$ 1,786

Loans And Allowance for Credit Losses (Credit Quality Indicators Personal Banking Loan Portfolio) (Details) - Personal Banking Portfolio Segment [Member]
$ in Thousands