Loans and Leases (Aging Of The Outstanding Loans and Leases By Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Past due loans	$ 170,374	$ 245,485
Current loans	32,345,815	32,546,490
Total loans and leases	32,516,189	32,791,975
SBA-PPP
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,100,000
Commercial
Financing Receivable, Past Due [Line Items]
Total loans and leases	22,229,345	22,558,060
Commercial | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,247,680	985,424
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total loans and leases	5,266,266	5,013,644
Consumer
Financing Receivable, Past Due [Line Items]
Total loans and leases	9,913,589	9,771,033
Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	391,768	348,123
Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,350,377	1,255,402
Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	5,701,346	5,561,686
Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,834,690	2,052,854
PCD Loans
Financing Receivable, Past Due [Line Items]
Past due loans	43,718	55,424
Current loans	329,537	407,458
Total loans and leases	373,255	462,882
Non-PCD Loans | Commercial
Financing Receivable, Past Due [Line Items]
Past due loans		67,117
Current loans		22,490,943
Total loans and leases		22,558,060
Non-PCD Loans | Commercial | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	1,657	3,086
Current loans	1,246,023	982,338
Total loans and leases	1,247,680	985,424
Non-PCD Loans | Commercial | Mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	20,961	25,071
Current loans	11,604,593	11,139,941
Total loans and leases	11,625,554	11,165,012
Non-PCD Loans | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	8,713	18,343
Current loans	2,994,215	2,969,346
Total loans and leases	3,002,928	2,987,689
Non-PCD Loans | Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due loans	23,233	20,617
Current loans	5,243,033	4,993,027
Total loans and leases	5,266,266	5,013,644
Non-PCD Loans | Commercial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Past due loans	54,564	0
Current loans	22,174,781	2,406,291
Total loans and leases	22,229,345	2,406,291
Non-PCD Loans | Commercial | SBA-PPP
Financing Receivable, Past Due [Line Items]
Past due loans	0
Current loans	1,086,917
Total loans and leases	1,086,917
Non-PCD Loans | Consumer
Financing Receivable, Past Due [Line Items]
Past due loans	72,092	122,944
Current loans	9,841,497	9,648,089
Total loans and leases	9,913,589	9,771,033
Non-PCD Loans | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	2,266	1,339
Current loans	389,502	346,784
Total loans and leases	391,768	348,123
Non-PCD Loans | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Past due loans	7,781	9,736
Current loans	1,342,596	1,245,666
Total loans and leases	1,350,377	1,255,402
Non-PCD Loans | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	45,888	83,272
Current loans	5,655,458	5,478,414
Total loans and leases	5,701,346	5,561,686
Non-PCD Loans | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	11,543	22,018
Current loans	1,823,147	2,030,836
Total loans and leases	1,834,690	2,052,854
Non-PCD Loans | Consumer | Consumer other
Financing Receivable, Past Due [Line Items]
Past due loans	4,614	6,579
Current loans	630,794	546,389
Total loans and leases	635,408	552,968
30 to 59 Days past due
Financing Receivable, Past Due [Line Items]
Past due loans	61,934	121,499
30 to 59 Days past due | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	477	932
30 to 59 Days past due | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Total loans and leases	5,345	6,825
30 to 59 Days past due | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	18,417	43,218
30 to 59 Days past due | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	5,587	11,977
30 to 59 Days past due | PCD Loans
Financing Receivable, Past Due [Line Items]
Past due loans	11,407	18,322
Total loans and leases	11,407	18,322
30 to 59 Days past due | Non-PCD Loans | Commercial
Financing Receivable, Past Due [Line Items]
Past due loans		36,615
30 to 59 Days past due | Non-PCD Loans | Commercial | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	233	956
30 to 59 Days past due | Non-PCD Loans | Commercial | Mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	7,210	8,757
30 to 59 Days past due | Non-PCD Loans | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	752	12,370
30 to 59 Days past due | Non-PCD Loans | Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due loans	10,309	14,532
30 to 59 Days past due | Non-PCD Loans | Commercial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Past due loans	18,504	0
30 to 59 Days past due | Non-PCD Loans | Commercial | SBA-PPP
Financing Receivable, Past Due [Line Items]
Past due loans	0
30 to 59 Days past due | Non-PCD Loans | Consumer
Financing Receivable, Past Due [Line Items]
Past due loans	32,023	66,562
30 to 59 Days past due | Non-PCD Loans | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	477	932
30 to 59 Days past due | Non-PCD Loans | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Past due loans	5,345	6,825
30 to 59 Days past due | Non-PCD Loans | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	18,417	43,218
30 to 59 Days past due | Non-PCD Loans | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	5,587	11,977
30 to 59 Days past due | Non-PCD Loans | Consumer | Consumer other
Financing Receivable, Past Due [Line Items]
Past due loans	2,197	3,610
60 to 89 Days past due
Financing Receivable, Past Due [Line Items]
Past due loans	27,296	26,043
60 to 89 Days past due | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,719	77
60 to 89 Days past due | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,173	1,835
60 to 89 Days past due | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	6,607	8,364
60 to 89 Days past due | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,443	2,626
60 to 89 Days past due | PCD Loans
Financing Receivable, Past Due [Line Items]
Past due loans	5,200	6,076
Total loans and leases	5,200	6,076
60 to 89 Days past due | Non-PCD Loans | Commercial
Financing Receivable, Past Due [Line Items]
Past due loans		5,601
60 to 89 Days past due | Non-PCD Loans | Commercial | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	0	527
60 to 89 Days past due | Non-PCD Loans | Commercial | Mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	5,553	2,232
60 to 89 Days past due | Non-PCD Loans | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	1,245	0
60 to 89 Days past due | Non-PCD Loans | Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due loans	3,234	2,842
60 to 89 Days past due | Non-PCD Loans | Commercial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Past due loans	10,032	0
60 to 89 Days past due | Non-PCD Loans | Commercial | SBA-PPP
Financing Receivable, Past Due [Line Items]
Past due loans	0
60 to 89 Days past due | Non-PCD Loans | Consumer
Financing Receivable, Past Due [Line Items]
Past due loans	12,064	14,366
60 to 89 Days past due | Non-PCD Loans | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	1,719	77
60 to 89 Days past due | Non-PCD Loans | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Past due loans	1,173	1,835
60 to 89 Days past due | Non-PCD Loans | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	6,607	8,364
60 to 89 Days past due | Non-PCD Loans | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	1,443	2,626
60 to 89 Days past due | Non-PCD Loans | Consumer | Consumer other
Financing Receivable, Past Due [Line Items]
Past due loans	1,122	1,464
90 Days or greater
Financing Receivable, Past Due [Line Items]
Past due loans	81,144	97,943
90 Days or greater | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	70	330
90 Days or greater | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,263	1,076
90 Days or greater | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	20,864	31,690
90 Days or greater | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	4,513	7,415
90 Days or greater | PCD Loans
Financing Receivable, Past Due [Line Items]
Past due loans	27,111	31,026
Total loans and leases	27,111	31,026
90 Days or greater | Non-PCD Loans | Commercial
Financing Receivable, Past Due [Line Items]
Past due loans		24,901
90 Days or greater | Non-PCD Loans | Commercial | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	1,424	1,603
90 Days or greater | Non-PCD Loans | Commercial | Mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	8,198	14,082
90 Days or greater | Non-PCD Loans | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	6,716	5,973
90 Days or greater | Non-PCD Loans | Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due loans	9,690	3,243
90 Days or greater | Non-PCD Loans | Commercial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Past due loans	26,028	0
90 Days or greater | Non-PCD Loans | Commercial | SBA-PPP
Financing Receivable, Past Due [Line Items]
Past due loans	0
90 Days or greater | Non-PCD Loans | Consumer
Financing Receivable, Past Due [Line Items]
Past due loans	28,005	42,016
90 Days or greater | Non-PCD Loans | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	70	330
90 Days or greater | Non-PCD Loans | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Past due loans	1,263	1,076
90 Days or greater | Non-PCD Loans | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	20,864	31,690
90 Days or greater | Non-PCD Loans | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	4,513	7,415
90 Days or greater | Non-PCD Loans | Consumer | Consumer other
Financing Receivable, Past Due [Line Items]
Past due loans	$ 1,295	$ 1,505