Loans And Allowance For Credit Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	$ 16,229,187	$ 15,116,475
30 – 89 Days Past Due	49,808	39,001
90 Days Past Due and Still Accruing	15,830	11,726
Non-accrual	8,306	9,157
Total	16,303,131	15,176,359
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,087,509	1,268,784
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	968,994	1,238,890
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	991,093	547,174
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	397,621	237,855
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	170,158	196,963
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	634,299	632,236
Revolving Loans Amortized Cost Basis	1,623,656	1,573,819
Financing Receivable, before Allowance for Credit Loss	5,873,330	5,695,721
Personal Banking Portfolio Segment [Member] | Over 90 days past due [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,060	416
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,218	1,485
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,541	555
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	139	374
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,655	171
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,621	1,532
Revolving Loans Amortized Cost Basis	7,091	6,716
Financing Receivable, before Allowance for Credit Loss	15,325	11,249
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	5,661,725	5,303,535
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	1,361,095	1,118,266
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	3,406,981	3,058,837
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,918,078	2,805,401
Real Estate - Personal [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	535,797	690,306
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	590,625	889,781
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	785,041	354,841
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	290,830	157,718
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	133,795	149,488
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	571,816	553,797
Revolving Loans Amortized Cost Basis	10,174	9,470
Financing Receivable, before Allowance for Credit Loss	2,918,078	2,805,401
Real Estate - Personal [Member] | Personal Banking Portfolio Segment [Member] | Over 90 days past due [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	514	133
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	967	1,150
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,338	298
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	81	124
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,388	97
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,393	1,181
Revolving Loans Amortized Cost Basis	0	0
Financing Receivable, before Allowance for Credit Loss	6,681	2,983
Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,059,088	2,032,225
Consumer Loan [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	536,755	571,738
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	378,369	349,109
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	206,052	192,333
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	106,791	80,137
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	36,363	47,475
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	62,483	78,439
Revolving Loans Amortized Cost Basis	732,275	712,994
Financing Receivable, before Allowance for Credit Loss	2,059,088	2,032,225
Consumer Loan [Member] | Personal Banking Portfolio Segment [Member] | Over 90 days past due [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	326	283
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	251	335
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	203	257
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	58	250
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	267	74
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	228	351
Revolving Loans Amortized Cost Basis	839	661
Financing Receivable, before Allowance for Credit Loss	2,172	2,211
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	297,207	275,945
Revolving Home Equity [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	297,207	275,945
Financing Receivable, before Allowance for Credit Loss	297,207	275,945
Revolving Home Equity [Member] | Personal Banking Portfolio Segment [Member] | Over 90 days past due [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	703	801
Financing Receivable, before Allowance for Credit Loss	703	801
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	584,000	575,410
Consumer Credit Card [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	584,000	575,410
Financing Receivable, before Allowance for Credit Loss	584,000	575,410
Consumer Credit Card [Member] | Personal Banking Portfolio Segment [Member] | Over 90 days past due [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	5,549	5,254
Financing Receivable, before Allowance for Credit Loss	5,549	5,254
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	14,957	6,740
Overdrafts [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	14,957	6,740
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	0	0
Financing Receivable, before Allowance for Credit Loss	14,957	6,740
Overdrafts [Member] | Personal Banking Portfolio Segment [Member] | Over 90 days past due [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	220	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Revolving Loans Amortized Cost Basis	0	0
Financing Receivable, before Allowance for Credit Loss	220	0
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	5,652,710	5,292,125
30 – 89 Days Past Due	1,759	3,621
90 Days Past Due and Still Accruing	505	477
Non-accrual	6,751	7,312
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	1,361,095	1,117,434
30 – 89 Days Past Due	0	832
90 Days Past Due and Still Accruing	0	0
Non-accrual	0	0
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	3,406,207	3,058,566
30 – 89 Days Past Due	585	57
90 Days Past Due and Still Accruing	0	0
Non-accrual	189	214
Personal Banking Portfolio Segment [Member] | Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,895,742	2,796,662
30 – 89 Days Past Due	14,289	4,125
90 Days Past Due and Still Accruing	6,681	2,983
Non-accrual	1,366	1,631
Personal Banking Portfolio Segment [Member] | Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,031,827	2,005,556
30 – 89 Days Past Due	25,089	24,458
90 Days Past Due and Still Accruing	2,172	2,211
Non-accrual	0	0
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	295,303	274,372
30 – 89 Days Past Due	1,201	772
90 Days Past Due and Still Accruing	703	801
Non-accrual	0	0
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	572,213	565,335
30 – 89 Days Past Due	6,238	4,821
90 Days Past Due and Still Accruing	5,549	5,254
Non-accrual	0	0
Personal Banking Portfolio Segment [Member] | Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	14,090	6,425
30 – 89 Days Past Due	647	315
90 Days Past Due and Still Accruing	220	0
Non-accrual	$ 0	$ 0