Loans And Allowance For Credit Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	$ 15,808,125	$ 15,116,475
30 - 89 Days Past Due	71,111	39,001
90 Days Past Due and Still Accruing	12,538	11,726
Non-accrual loans	7,184	9,157
Total	15,898,958	15,176,359
Business
Loans And Allowance For Loan Losses [Line Items]
Total	5,528,895	5,303,535
Real estate - construction and land
Loans And Allowance For Loan Losses [Line Items]
Total	1,206,955	1,118,266
Real estate - business
Loans And Allowance For Loan Losses [Line Items]
Total	3,331,627	3,058,837
Real estate - personal
Loans And Allowance For Loan Losses [Line Items]
Total	2,862,519	2,805,401
Consumer
Loans And Allowance For Loan Losses [Line Items]
Total	2,116,371	2,032,225
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	286,026	275,945
Consumer credit card
Loans And Allowance For Loan Losses [Line Items]
Total	563,349	575,410
Overdrafts
Loans And Allowance For Loan Losses [Line Items]
Total	3,216	6,740
Commercial Portfolio Segment [Member] | Business
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	5,513,234	5,292,125
30 - 89 Days Past Due	9,480	3,621
90 Days Past Due and Still Accruing	536	477
Non-accrual loans	5,645	7,312
Commercial Portfolio Segment [Member] | Real estate - construction and land
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	1,206,395	1,117,434
30 - 89 Days Past Due	560	832
90 Days Past Due and Still Accruing	0	0
Non-accrual loans	0	0
Commercial Portfolio Segment [Member] | Real estate - business
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	3,307,921	3,058,566
30 - 89 Days Past Due	23,557	57
90 Days Past Due and Still Accruing	0	0
Non-accrual loans	149	214
Personal Banking Portfolio Segment [Member] | Real estate - personal
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,847,665	2,796,662
30 - 89 Days Past Due	10,506	4,125
90 Days Past Due and Still Accruing	2,958	2,983
Non-accrual loans	1,390	1,631
Personal Banking Portfolio Segment [Member] | Consumer
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,091,670	2,005,556
30 - 89 Days Past Due	21,135	24,458
90 Days Past Due and Still Accruing	3,566	2,211
Non-accrual loans	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	284,595	274,372
30 - 89 Days Past Due	541	772
90 Days Past Due and Still Accruing	890	801
Non-accrual loans	0	0
Personal Banking Portfolio Segment [Member] | Consumer credit card
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	553,815	565,335
30 - 89 Days Past Due	4,989	4,821
90 Days Past Due and Still Accruing	4,545	5,254
Non-accrual loans	0	0
Personal Banking Portfolio Segment [Member] | Overdrafts
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,830	6,425
30 - 89 Days Past Due	343	315
90 Days Past Due and Still Accruing	43	0
Non-accrual loans	$ 0	$ 0