Loans And Allowance for Credit Losses (Credit Quality Indicators Personal Banking Loan Portfolio) (Details) - Personal Banking Portfolio Segment [Member] - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Credit Quality Indicator [Line Items]
Current Fiscal Year	$ 367,727	$ 1,268,784
Fiscal Year before Current Fiscal Year	1,173,495	1,238,890
Two Years before Current Fiscal Year	1,164,234	547,174
Three Years before Current Fiscal Year	494,641	237,855
Four Years before Current Fiscal Year	216,740	196,963
Prior	767,155	632,236
Revolving Loans Amortized Cost Basis	1,512,435	1,573,819
Total	5,696,427	5,695,721
Real estate - personal
Credit Quality Indicator [Line Items]
Current Fiscal Year	144,994	690,306
Fiscal Year before Current Fiscal Year	668,371	889,781
Two Years before Current Fiscal Year	854,025	354,841
Three Years before Current Fiscal Year	328,517	157,718
Four Years before Current Fiscal Year	150,365	149,488
Prior	663,842	553,797
Revolving Loans Amortized Cost Basis	9,962	9,470
Total	2,820,076	2,805,401
Consumer
Credit Quality Indicator [Line Items]
Current Fiscal Year	208,522	571,738
Fiscal Year before Current Fiscal Year	505,124	349,109
Two Years before Current Fiscal Year	310,209	192,333
Three Years before Current Fiscal Year	166,124	80,137
Four Years before Current Fiscal Year	66,375	47,475
Prior	103,313	78,439
Revolving Loans Amortized Cost Basis	693,493	712,994
Total	2,053,160	2,032,225
Revolving Home Equity [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	264,401	275,945
Total	264,401	275,945
Consumer credit card
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	544,579	575,410
Total	544,579	575,410
Overdrafts
Credit Quality Indicator [Line Items]
Current Fiscal Year	14,211	6,740
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Total	14,211	6,740
Current to 90 Days Past Due
Credit Quality Indicator [Line Items]
Current Fiscal Year	367,727	1,268,253
Fiscal Year before Current Fiscal Year	1,173,020	1,237,405
Two Years before Current Fiscal Year	1,163,115	546,368
Three Years before Current Fiscal Year	494,090	237,372
Four Years before Current Fiscal Year	216,319	196,792
Prior	764,724	629,548
Revolving Loans Amortized Cost Basis	1,505,714	1,567,103
Total	5,684,709	5,682,841
Current to 90 Days Past Due | Real estate - personal
Credit Quality Indicator [Line Items]
Current Fiscal Year	144,994	690,058
Fiscal Year before Current Fiscal Year	668,179	888,631
Two Years before Current Fiscal Year	853,063	354,292
Three Years before Current Fiscal Year	328,209	157,485
Four Years before Current Fiscal Year	150,144	149,391
Prior	661,855	551,460
Revolving Loans Amortized Cost Basis	9,962	9,470
Total	2,816,406	2,800,787
Current to 90 Days Past Due | Consumer
Credit Quality Indicator [Line Items]
Current Fiscal Year	208,522	571,455
Fiscal Year before Current Fiscal Year	504,841	348,774
Two Years before Current Fiscal Year	310,052	192,076
Three Years before Current Fiscal Year	165,881	79,887
Four Years before Current Fiscal Year	66,175	47,401
Prior	102,869	78,088
Revolving Loans Amortized Cost Basis	692,230	712,333
Total	2,050,570	2,030,014
Current to 90 Days Past Due | Revolving Home Equity [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	263,547	275,144
Total	263,547	275,144
Current to 90 Days Past Due | Consumer credit card
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	539,975	570,156
Total	539,975	570,156
Current to 90 Days Past Due | Overdrafts
Credit Quality Indicator [Line Items]
Current Fiscal Year	14,211	6,740
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Total	14,211	6,740
Over 90 days past due
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	416
Fiscal Year before Current Fiscal Year	475	1,485
Two Years before Current Fiscal Year	1,119	555
Three Years before Current Fiscal Year	369	374
Four Years before Current Fiscal Year	314	171
Prior	1,331	1,532
Revolving Loans Amortized Cost Basis	6,721	6,716
Total	10,329	11,249
Over 90 days past due | Real estate - personal
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	133
Fiscal Year before Current Fiscal Year	192	1,150
Two Years before Current Fiscal Year	962	298
Three Years before Current Fiscal Year	126	124
Four Years before Current Fiscal Year	114	97
Prior	887	1,181
Revolving Loans Amortized Cost Basis	0	0
Total	2,281	2,983
Over 90 days past due | Consumer
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	283
Fiscal Year before Current Fiscal Year	283	335
Two Years before Current Fiscal Year	157	257
Three Years before Current Fiscal Year	243	250
Four Years before Current Fiscal Year	200	74
Prior	444	351
Revolving Loans Amortized Cost Basis	1,263	661
Total	2,590	2,211
Over 90 days past due | Revolving Home Equity [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	854	801
Total	854	801
Over 90 days past due | Consumer credit card
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	4,604	5,254
Total	4,604	5,254
Non-Accrual [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	115
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	251
Three Years before Current Fiscal Year	182	109
Four Years before Current Fiscal Year	107	0
Prior	1,100	1,156
Revolving Loans Amortized Cost Basis	0	0
Total	1,389	1,631
Non-Accrual [Member] | Real estate - personal
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	115
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	251
Three Years before Current Fiscal Year	182	109
Four Years before Current Fiscal Year	107	0
Prior	1,100	1,156
Revolving Loans Amortized Cost Basis	0	0
Total	$ 1,389	$ 1,631