Loans And Allowance For Credit Losses (Credit Quality Indicators Commercial Loan Portfolio) (Details) - Commercial Portfolio Segment [Member] - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Credit Quality Indicator [Line Items]
Current Fiscal Year	$ 1,592,513	$ 2,917,439
Fiscal Year before Current Fiscal Year	2,375,535	1,869,035
Two Years before Current Fiscal Year	1,425,038	1,223,303
Three Years before Current Fiscal Year	1,027,796	555,494
Four Years before Current Fiscal Year	451,256	408,432
Prior	804,035	593,927
Revolving Loans Amortized Cost Basis	2,247,257	1,913,008
Total	9,923,430	9,480,638
Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	673,750	1,476,920
Fiscal Year before Current Fiscal Year	1,028,595	705,474
Two Years before Current Fiscal Year	564,096	581,191
Three Years before Current Fiscal Year	461,846	267,274
Four Years before Current Fiscal Year	212,032	160,729
Prior	360,076	289,793
Revolving Loans Amortized Cost Basis	2,141,197	1,822,154
Total	5,441,592	5,303,535
Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	329,256	643,868
Fiscal Year before Current Fiscal Year	625,915	358,127
Two Years before Current Fiscal Year	202,365	66,985
Three Years before Current Fiscal Year	58,550	17,991
Four Years before Current Fiscal Year	16,411	15,813
Prior	15,453	2,252
Revolving Loans Amortized Cost Basis	18,310	13,230
Total	1,266,260	1,118,266
Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	589,507	796,651
Fiscal Year before Current Fiscal Year	721,025	805,434
Two Years before Current Fiscal Year	658,577	575,127
Three Years before Current Fiscal Year	507,400	270,229
Four Years before Current Fiscal Year	222,813	231,890
Prior	428,506	301,882
Revolving Loans Amortized Cost Basis	87,750	77,624
Total	3,215,578	3,058,837
Pass [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	1,586,212	2,848,164
Fiscal Year before Current Fiscal Year	2,319,918	1,762,837
Two Years before Current Fiscal Year	1,349,811	1,173,441
Three Years before Current Fiscal Year	1,000,836	480,987
Four Years before Current Fiscal Year	391,166	332,781
Prior	681,486	527,195
Revolving Loans Amortized Cost Basis	2,234,761	1,884,944
Total	9,564,190	9,010,349
Pass [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	668,983	1,473,869
Fiscal Year before Current Fiscal Year	1,026,985	704,157
Two Years before Current Fiscal Year	562,836	554,759
Three Years before Current Fiscal Year	456,621	248,739
Four Years before Current Fiscal Year	206,448	159,238
Prior	337,860	270,454
Revolving Loans Amortized Cost Basis	2,129,662	1,795,073
Total	5,389,395	5,206,289
Pass [Member] | Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	329,256	598,734
Fiscal Year before Current Fiscal Year	606,428	346,507
Two Years before Current Fiscal Year	190,785	66,985
Three Years before Current Fiscal Year	58,550	2,110
Four Years before Current Fiscal Year	536	2,655
Prior	2,278	2,252
Revolving Loans Amortized Cost Basis	18,310	13,230
Total	1,206,143	1,032,473
Pass [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	587,973	775,561
Fiscal Year before Current Fiscal Year	686,505	712,173
Two Years before Current Fiscal Year	596,190	551,697
Three Years before Current Fiscal Year	485,665	230,138
Four Years before Current Fiscal Year	184,182	170,888
Prior	341,348	254,489
Revolving Loans Amortized Cost Basis	86,789	76,641
Total	2,968,652	2,771,587
Special Mention [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	2,202	50,445
Fiscal Year before Current Fiscal Year	4,140	30,448
Two Years before Current Fiscal Year	878	28,076
Three Years before Current Fiscal Year	9,863	50,611
Four Years before Current Fiscal Year	6,011	3,558
Prior	9,415	5,335
Revolving Loans Amortized Cost Basis	2,043	16,546
Total	34,552	185,019
Special Mention [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	2,202	1,785
Fiscal Year before Current Fiscal Year	648	126
Two Years before Current Fiscal Year	232	17,576
Three Years before Current Fiscal Year	972	12,050
Four Years before Current Fiscal Year	74	1,490
Prior	7,336	3,232
Revolving Loans Amortized Cost Basis	2,043	16,545
Total	13,507	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	967	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Total	967	45,634
Special Mention [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	0	4,011
Fiscal Year before Current Fiscal Year	3,492	30,322
Two Years before Current Fiscal Year	646	10,500
Three Years before Current Fiscal Year	8,891	37,576
Four Years before Current Fiscal Year	4,970	2,068
Prior	2,079	2,103
Revolving Loans Amortized Cost Basis	0	1
Total	20,078	86,581
Substandard [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	3,832	18,400
Fiscal Year before Current Fiscal Year	51,395	75,750
Two Years before Current Fiscal Year	74,349	21,785
Three Years before Current Fiscal Year	17,093	22,158
Four Years before Current Fiscal Year	52,489	72,093
Prior	108,596	56,040
Revolving Loans Amortized Cost Basis	10,453	11,518
Total	318,207	277,744
Substandard [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	2,298	836
Fiscal Year before Current Fiscal Year	880	1,191
Two Years before Current Fiscal Year	1,028	8,855
Three Years before Current Fiscal Year	4,249	4,936
Four Years before Current Fiscal Year	4,077	1
Prior	10,352	10,775
Revolving Loans Amortized Cost Basis	9,492	10,536
Total	32,376	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	19,487	11,620
Two Years before Current Fiscal Year	11,580	0
Three Years before Current Fiscal Year	0	14,896
Four Years before Current Fiscal Year	14,908	13,158
Prior	13,175	0
Revolving Loans Amortized Cost Basis	0	0
Total	59,150	40,159
Substandard [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	1,534	17,079
Fiscal Year before Current Fiscal Year	31,028	62,939
Two Years before Current Fiscal Year	61,741	12,930
Three Years before Current Fiscal Year	12,844	2,326
Four Years before Current Fiscal Year	33,504	58,934
Prior	85,069	45,265
Revolving Loans Amortized Cost Basis	961	982
Total	226,681	200,455
Non-Accrual [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	267	430
Fiscal Year before Current Fiscal Year	82	0
Two Years before Current Fiscal Year	0	1
Three Years before Current Fiscal Year	4	1,738
Four Years before Current Fiscal Year	1,590	0
Prior	4,538	5,357
Revolving Loans Amortized Cost Basis	0	0
Total	6,481	7,526
Non-Accrual [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	267	430
Fiscal Year before Current Fiscal Year	82	0
Two Years before Current Fiscal Year	0	1
Three Years before Current Fiscal Year	4	1,549
Four Years before Current Fiscal Year	1,433	0
Prior	4,528	5,332
Revolving Loans Amortized Cost Basis	0	0
Total	6,314	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	157	0
Prior	10	25
Revolving Loans Amortized Cost Basis	0	0
Total	$ 167	$ 214