Loans And Allowance For Credit Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	$ 15,116,475	$ 16,230,056
30 – 89 Days Past Due	39,001	50,855
90 Days Past Due and Still Accruing	11,726	22,190
Non-accrual	9,157	26,540
Total	15,176,359	16,329,641
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	5,303,535	6,546,087
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	1,118,266	1,021,595
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	3,058,837	3,026,117
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,805,401	2,820,030
Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,032,225	1,950,502
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	275,945	307,083
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	575,410	655,078
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,740	3,149
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	5,292,125	6,517,838
30 – 89 Days Past Due	3,621	2,252
90 Days Past Due and Still Accruing	477	3,473
Non-accrual	7,312	22,524
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	1,117,434	1,021,592
30 – 89 Days Past Due	832	0
90 Days Past Due and Still Accruing	0	3
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	3,058,566	3,016,215
30 – 89 Days Past Due	57	7,666
90 Days Past Due and Still Accruing	0	6
Non-accrual	214	2,230
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	2,796,662	2,808,886
30 – 89 Days Past Due	4,125	6,521
90 Days Past Due and Still Accruing	2,983	2,837
Non-accrual	1,631	1,786
Personal Banking Portfolio Segment [Member] | Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,005,556	1,921,822
30 – 89 Days Past Due	24,458	25,417
90 Days Past Due and Still Accruing	2,211	3,263
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	274,372	305,037
30 – 89 Days Past Due	772	1,656
90 Days Past Due and Still Accruing	801	390
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	565,335	635,770
30 – 89 Days Past Due	4,821	7,090
90 Days Past Due and Still Accruing	5,254	12,218
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	6,425	2,896
30 – 89 Days Past Due	315	253
90 Days Past Due and Still Accruing	0	0
Non-accrual	$ 0	$ 0