Loans And Allowance For Credit Losses (Credit Quality Indicators Commercial Loan Portfolio) (Details) - Commercial Portfolio Segment [Member] - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Credit Quality Indicator [Line Items]
Current Fiscal Year	$ 2,456,180	$ 2,917,439
Fiscal Year before Current Fiscal Year	2,170,030	1,869,035
Two Years before Current Fiscal Year	1,309,639	1,223,303
Three Years before Current Fiscal Year	917,147	555,494
Four Years before Current Fiscal Year	410,742	408,432
Prior	648,366	593,927
Revolving Loans Amortized Cost Basis	2,155,373	1,913,008
Total	10,067,477	9,480,638
Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	1,176,976	1,476,920
Fiscal Year before Current Fiscal Year	913,679	705,474
Two Years before Current Fiscal Year	520,257	581,191
Three Years before Current Fiscal Year	400,428	267,274
Four Years before Current Fiscal Year	192,162	160,729
Prior	277,606	289,793
Revolving Loans Amortized Cost Basis	2,047,787	1,822,154
Total	5,528,895	5,303,535
Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	399,880	643,868
Fiscal Year before Current Fiscal Year	580,430	358,127
Two Years before Current Fiscal Year	150,642	66,985
Three Years before Current Fiscal Year	26,840	17,991
Four Years before Current Fiscal Year	16,288	15,813
Prior	15,401	2,252
Revolving Loans Amortized Cost Basis	17,474	13,230
Total	1,206,955	1,118,266
Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	879,324	796,651
Fiscal Year before Current Fiscal Year	675,921	805,434
Two Years before Current Fiscal Year	638,740	575,127
Three Years before Current Fiscal Year	489,879	270,229
Four Years before Current Fiscal Year	202,292	231,890
Prior	355,359	301,882
Revolving Loans Amortized Cost Basis	90,112	77,624
Total	3,331,627	3,058,837
Pass [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	2,444,091	2,848,164
Fiscal Year before Current Fiscal Year	2,105,092	1,762,837
Two Years before Current Fiscal Year	1,236,574	1,173,441
Three Years before Current Fiscal Year	891,480	480,987
Four Years before Current Fiscal Year	356,871	332,781
Prior	550,219	527,195
Revolving Loans Amortized Cost Basis	2,149,584	1,884,944
Total	9,733,911	9,010,349
Pass [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	1,167,741	1,473,869
Fiscal Year before Current Fiscal Year	902,680	704,157
Two Years before Current Fiscal Year	519,179	554,759
Three Years before Current Fiscal Year	396,052	248,739
Four Years before Current Fiscal Year	188,319	159,238
Prior	255,455	270,454
Revolving Loans Amortized Cost Basis	2,041,998	1,795,073
Total	5,471,424	5,206,289
Pass [Member] | Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	399,880	598,734
Fiscal Year before Current Fiscal Year	560,930	346,507
Two Years before Current Fiscal Year	140,643	66,985
Three Years before Current Fiscal Year	26,840	2,110
Four Years before Current Fiscal Year	1,362	2,655
Prior	2,208	2,252
Revolving Loans Amortized Cost Basis	17,474	13,230
Total	1,149,337	1,032,473
Pass [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	876,470	775,561
Fiscal Year before Current Fiscal Year	641,482	712,173
Two Years before Current Fiscal Year	576,752	551,697
Three Years before Current Fiscal Year	468,588	230,138
Four Years before Current Fiscal Year	167,190	170,888
Prior	292,556	254,489
Revolving Loans Amortized Cost Basis	90,112	76,641
Total	3,113,150	2,771,587
Special Mention [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	5,059	50,445
Fiscal Year before Current Fiscal Year	8,982	30,448
Two Years before Current Fiscal Year	856	28,076
Three Years before Current Fiscal Year	10,489	50,611
Four Years before Current Fiscal Year	1,055	3,558
Prior	8,520	5,335
Revolving Loans Amortized Cost Basis	1,923	16,546
Total	36,884	185,019
Special Mention [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	2,205	1,785
Fiscal Year before Current Fiscal Year	5,535	126
Two Years before Current Fiscal Year	224	17,576
Three Years before Current Fiscal Year	635	12,050
Four Years before Current Fiscal Year	70	1,490
Prior	7,994	3,232
Revolving Loans Amortized Cost Basis	1,923	16,545
Total	18,586	52,804
Special Mention [Member] | Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	44,649
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	985
Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Total	0	45,634
Special Mention [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	2,854	4,011
Fiscal Year before Current Fiscal Year	3,447	30,322
Two Years before Current Fiscal Year	632	10,500
Three Years before Current Fiscal Year	9,854	37,576
Four Years before Current Fiscal Year	985	2,068
Prior	526	2,103
Revolving Loans Amortized Cost Basis	0	1
Total	18,298	86,581
Substandard [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	6,600	18,400
Fiscal Year before Current Fiscal Year	55,901	75,750
Two Years before Current Fiscal Year	72,149	21,785
Three Years before Current Fiscal Year	15,127	22,158
Four Years before Current Fiscal Year	51,720	72,093
Prior	85,525	56,040
Revolving Loans Amortized Cost Basis	3,866	11,518
Total	290,888	277,744
Substandard [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	6,600	836
Fiscal Year before Current Fiscal Year	5,409	1,191
Two Years before Current Fiscal Year	794	8,855
Three Years before Current Fiscal Year	3,690	4,936
Four Years before Current Fiscal Year	2,817	1
Prior	10,064	10,775
Revolving Loans Amortized Cost Basis	3,866	10,536
Total	33,240	37,130
Substandard [Member] | Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	485
Fiscal Year before Current Fiscal Year	19,500	11,620
Two Years before Current Fiscal Year	9,999	0
Three Years before Current Fiscal Year	0	14,896
Four Years before Current Fiscal Year	14,926	13,158
Prior	13,193	0
Revolving Loans Amortized Cost Basis	0	0
Total	57,618	40,159
Substandard [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	17,079
Fiscal Year before Current Fiscal Year	30,992	62,939
Two Years before Current Fiscal Year	61,356	12,930
Three Years before Current Fiscal Year	11,437	2,326
Four Years before Current Fiscal Year	33,977	58,934
Prior	62,268	45,265
Revolving Loans Amortized Cost Basis	0	982
Total	200,030	200,455
Non-Accrual [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	430	430
Fiscal Year before Current Fiscal Year	55	0
Two Years before Current Fiscal Year	60	1
Three Years before Current Fiscal Year	51	1,738
Four Years before Current Fiscal Year	1,096	0
Prior	4,102	5,357
Revolving Loans Amortized Cost Basis	0	0
Total	5,794	7,526
Non-Accrual [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	430	430
Fiscal Year before Current Fiscal Year	55	0
Two Years before Current Fiscal Year	60	1
Three Years before Current Fiscal Year	51	1,549
Four Years before Current Fiscal Year	956	0
Prior	4,093	5,332
Revolving Loans Amortized Cost Basis	0	0
Total	5,645	7,312
Non-Accrual [Member] | Real estate - business
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	189
Four Years before Current Fiscal Year	140	0
Prior	9	25
Revolving Loans Amortized Cost Basis	0	0
Total	$ 149	$ 214