Loans and Leases (Aging Of The Outstanding Loans and Leases By Class) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Past due loans	$ 187,774	$ 245,485
Current loans	32,501,878	32,546,490
Total loans and leases	32,689,652	32,791,975
Commercial
Financing Receivable, Past Due [Line Items]
Total loans and leases	22,490,907	22,558,060
Commercial | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,183,929	985,424
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total loans and leases	5,067,163	5,013,644
Consumer
Financing Receivable, Past Due [Line Items]
Total loans and leases	9,802,239	9,771,033
Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	376,492	348,123
Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,287,541	1,255,402
Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	5,652,458	5,561,686
Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,884,633	2,052,854
Non-PCI 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-PCI Loans | Commercial | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	4,391	3,086
Current loans	1,179,538	982,338
Total loans and leases	1,183,929	985,424
Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	26,088	25,071
Current loans	11,499,982	11,139,941
Total loans and leases	11,526,070	11,165,012
Non-PCI Loans | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	12,368	18,343
Current loans	3,002,961	2,969,346
Total loans and leases	3,015,329	2,987,689
Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due loans	22,398	20,617
Current loans	5,044,765	4,993,027
Total loans and leases	5,067,163	5,013,644
Non-PCI Loans | Commercial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Past due loans	65,245	0
Current loans	22,425,662	2,406,291
Total loans and leases	22,490,907	2,406,291
Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Past Due [Line Items]
Past due loans	0
Current loans	1,698,416
Total loans and leases	1,698,416
Non-PCI Loans | Consumer
Financing Receivable, Past Due [Line Items]
Past due loans	76,026	122,944
Current loans	9,726,213	9,648,089
Total loans and leases	9,802,239	9,771,033
Non-PCI Loans | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	880	1,339
Current loans	375,612	346,784
Total loans and leases	376,492	348,123
Non-PCI Loans | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Past due loans	7,553	9,736
Current loans	1,279,988	1,245,666
Total loans and leases	1,287,541	1,255,402
Non-PCI Loans | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	44,980	83,272
Current loans	5,607,478	5,478,414
Total loans and leases	5,652,458	5,561,686
Non-PCI Loans | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	17,362	22,018
Current loans	1,867,271	2,030,836
Total loans and leases	1,884,633	2,052,854
Non-PCI Loans | Consumer | Consumer other
Financing Receivable, Past Due [Line Items]
Past due loans	5,251	6,579
Current loans	595,864	546,389
Total loans and leases	601,115	552,968
PCD Loans
Financing Receivable, Past Due [Line Items]
Past due loans	46,503	55,424
Current loans	350,003	407,458
Total loans and leases	396,506	462,882
30 to 59 Days past due
Financing Receivable, Past Due [Line Items]
Past due loans	74,991	121,499
30 to 59 Days past due | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	684	932
30 to 59 Days past due | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Total loans and leases	5,410	6,825
30 to 59 Days past due | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	15,387	43,218
30 to 59 Days past due | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	7,277	11,977
30 to 59 Days past due | Non-PCI Loans | Commercial
Financing Receivable, Past Due [Line Items]
Past due loans		36,615
30 to 59 Days past due | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	2,049	956
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	11,258	8,757
30 to 59 Days past due | Non-PCI Loans | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	5,356	12,370
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due loans	11,809	14,532
30 to 59 Days past due | Non-PCI Loans | Commercial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Past due loans	30,472	0
30 to 59 Days past due | Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Past Due [Line Items]
Past due loans	0
30 to 59 Days past due | Non-PCI Loans | Consumer
Financing Receivable, Past Due [Line Items]
Past due loans	31,847	66,562
30 to 59 Days past due | Non-PCI Loans | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	684	932
30 to 59 Days past due | Non-PCI Loans | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Past due loans	5,410	6,825
30 to 59 Days past due | Non-PCI Loans | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	15,387	43,218
30 to 59 Days past due | Non-PCI Loans | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	7,277	11,977
30 to 59 Days past due | Non-PCI Loans | Consumer | Consumer other
Financing Receivable, Past Due [Line Items]
Past due loans	3,089	3,610
30 to 59 Days past due | PCD Loans
Financing Receivable, Past Due [Line Items]
Past due loans	12,672	18,322
Total loans and leases	12,672	18,322
60 to 89 Days past due
Financing Receivable, Past Due [Line Items]
Past due loans	25,767	26,043
60 to 89 Days past due | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	69	77
60 to 89 Days past due | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,098	1,835
60 to 89 Days past due | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	5,605	8,364
60 to 89 Days past due | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	2,157	2,626
60 to 89 Days past due | Non-PCI Loans | Commercial
Financing Receivable, Past Due [Line Items]
Past due loans		5,601
60 to 89 Days past due | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	0	527
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	4,071	2,232
60 to 89 Days past due | Non-PCI Loans | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	3,659	0
60 to 89 Days past due | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due loans	3,370	2,842
60 to 89 Days past due | Non-PCI Loans | Commercial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Past due loans	11,100	0
60 to 89 Days past due | Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Past Due [Line Items]
Past due loans	0
60 to 89 Days past due | Non-PCI Loans | Consumer
Financing Receivable, Past Due [Line Items]
Past due loans	9,949	14,366
60 to 89 Days past due | Non-PCI Loans | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	69	77
60 to 89 Days past due | Non-PCI Loans | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Past due loans	1,098	1,835
60 to 89 Days past due | Non-PCI Loans | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	5,605	8,364
60 to 89 Days past due | Non-PCI Loans | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	2,157	2,626
60 to 89 Days past due | Non-PCI Loans | Consumer | Consumer other
Financing Receivable, Past Due [Line Items]
Past due loans	1,020	1,464
60 to 89 Days past due | PCD Loans
Financing Receivable, Past Due [Line Items]
Past due loans	4,718	6,076
Total loans and leases	4,718	6,076
90 Days or greater
Financing Receivable, Past Due [Line Items]
Past due loans	87,016	97,943
90 Days or greater | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	127	330
90 Days or greater | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,045	1,076
90 Days or greater | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	23,988	31,690
90 Days or greater | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	7,928	7,415
90 Days or greater | Non-PCI Loans | Commercial
Financing Receivable, Past Due [Line Items]
Past due loans		24,901
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	2,342	1,603
90 Days or greater | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	10,759	14,082
90 Days or greater | Non-PCI Loans | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	3,353	5,973
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due loans	7,219	3,243
90 Days or greater | Non-PCI Loans | Commercial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Past due loans	23,673	0
90 Days or greater | Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Past Due [Line Items]
Past due loans	0
90 Days or greater | Non-PCI Loans | Consumer
Financing Receivable, Past Due [Line Items]
Past due loans	34,230	42,016
90 Days or greater | Non-PCI Loans | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	127	330
90 Days or greater | Non-PCI Loans | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Past due loans	1,045	1,076
90 Days or greater | Non-PCI Loans | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	23,988	31,690
90 Days or greater | Non-PCI Loans | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	7,928	7,415
90 Days or greater | Non-PCI Loans | Consumer | Consumer other
Financing Receivable, Past Due [Line Items]
Past due loans	1,142	1,505
90 Days or greater | PCD Loans
Financing Receivable, Past Due [Line Items]
Past due loans	29,113	31,026
Total loans and leases	$ 29,113	$ 31,026