Loans And Allowance for Credit Losses (Credit Quality Indicators Personal Banking Loan Portfolio) (Details) - Personal Banking Portfolio Segment [Member] $ in Thousands	Jun. 30, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 921,843
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,010,670
Financing Receivable, Originated Two Years before Latest Fiscal Year	491,922
Financing Receivable, Originated Three Years before Latest Fiscal Year	415,375
Financing Receivable, Originated Four Years before Latest Fiscal Year	378,075
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	799,494
Financing Receivable, Revolving	1,646,273
Financing Receivable, before Allowance for Credit Loss, Total	5,663,652
Real Estate - Personal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	631,741
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	578,883
Financing Receivable, Originated Two Years before Latest Fiscal Year	273,129
Financing Receivable, Originated Three Years before Latest Fiscal Year	251,661
Financing Receivable, Originated Four Years before Latest Fiscal Year	271,348
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	673,408
Financing Receivable, Revolving	10,372
Financing Receivable, before Allowance for Credit Loss, Total	2,690,542
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	284,923
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	431,787
Financing Receivable, Originated Two Years before Latest Fiscal Year	218,793
Financing Receivable, Originated Three Years before Latest Fiscal Year	163,714
Financing Receivable, Originated Four Years before Latest Fiscal Year	106,727
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	126,086
Financing Receivable, Revolving	634,677
Financing Receivable, before Allowance for Credit Loss, Total	1,966,707
Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	334,627
Financing Receivable, before Allowance for Credit Loss, Total	334,627
Consumer Credit Card [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	666,597
Financing Receivable, before Allowance for Credit Loss, Total	666,597
Overdrafts [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	5,179
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	5,179
Current to 90 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	920,217
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,006,916
Financing Receivable, Originated Two Years before Latest Fiscal Year	490,955
Financing Receivable, Originated Three Years before Latest Fiscal Year	413,939
Financing Receivable, Originated Four Years before Latest Fiscal Year	376,048
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	793,559
Financing Receivable, Revolving	1,636,350
Financing Receivable, before Allowance for Credit Loss, Total	5,637,984
Current to 90 Days Past Due | Real Estate - Personal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	630,115
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	575,509
Financing Receivable, Originated Two Years before Latest Fiscal Year	272,310
Financing Receivable, Originated Three Years before Latest Fiscal Year	250,490
Financing Receivable, Originated Four Years before Latest Fiscal Year	269,505
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	668,025
Financing Receivable, Revolving	10,372
Financing Receivable, before Allowance for Credit Loss, Total	2,676,326
Current to 90 Days Past Due | Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	284,923
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	431,407
Financing Receivable, Originated Two Years before Latest Fiscal Year	218,645
Financing Receivable, Originated Three Years before Latest Fiscal Year	163,449
Financing Receivable, Originated Four Years before Latest Fiscal Year	106,543
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	125,534
Financing Receivable, Revolving	633,772
Financing Receivable, before Allowance for Credit Loss, Total	1,964,273
Current to 90 Days Past Due | Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	334,014
Financing Receivable, before Allowance for Credit Loss, Total	334,014
Current to 90 Days Past Due | Consumer Credit Card [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	658,192
Financing Receivable, before Allowance for Credit Loss, Total	658,192
Current to 90 Days Past Due | Overdrafts [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	5,179
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	5,179
Over 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,626
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,753
Financing Receivable, Originated Two Years before Latest Fiscal Year	967
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,391
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,960
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4,369
Financing Receivable, Revolving	9,923
Financing Receivable, before Allowance for Credit Loss, Total	23,989
Over 90 days past due | Real Estate - Personal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,626
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,373
Financing Receivable, Originated Two Years before Latest Fiscal Year	819
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,126
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,776
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,817
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	12,537
Over 90 days past due | Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	380
Financing Receivable, Originated Two Years before Latest Fiscal Year	148
Financing Receivable, Originated Three Years before Latest Fiscal Year	265
Financing Receivable, Originated Four Years before Latest Fiscal Year	184
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	552
Financing Receivable, Revolving	905
Financing Receivable, before Allowance for Credit Loss, Total	2,434
Over 90 days past due | Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	613
Financing Receivable, before Allowance for Credit Loss, Total	613
Over 90 days past due | Consumer Credit Card [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	8,405
Financing Receivable, before Allowance for Credit Loss, Total	8,405
Over 90 days past due | Overdrafts [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	0
Non-Accrual [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	45
Financing Receivable, Originated Four Years before Latest Fiscal Year	67
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,566
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	1,679
Non-Accrual [Member] | Real Estate - Personal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	45
Financing Receivable, Originated Four Years before Latest Fiscal Year	67
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,566
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	$ 1,679