Loans and Leases (Aging Of The Outstanding Loans and Leases By Class) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Past due loans	$ 215,919	$ 245,485
Current loans	32,964,932	32,546,490
Total loans and leases	33,180,851	32,791,975
Commercial
Financing Receivable, Past Due [Line Items]
Total loans and leases	23,097,302	22,558,060
Commercial | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,022,087	985,424
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total loans and leases	4,946,445	5,013,644
Consumer
Financing Receivable, Past Due [Line Items]
Total loans and leases	9,650,776	9,771,033
Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	336,065	348,123
Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,271,586	1,255,402
Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	5,566,026	5,561,686
Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,938,422	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	1,872	3,086
Current loans	1,020,215	982,338
Total loans and leases	1,022,087	985,424
Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	27,177	25,071
Current loans	11,313,789	11,139,941
Total loans and leases	11,340,966	11,165,012
Non-PCI Loans | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	14,266	18,343
Current loans	3,003,632	2,969,346
Total loans and leases	3,017,898	2,987,689
Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due loans	21,304	20,617
Current loans	4,925,141	4,993,027
Total loans and leases	4,946,445	5,013,644
Non-PCI Loans | Commercial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Past due loans	64,619	0
Current loans	23,032,683	2,406,291
Total loans and leases	23,097,302	2,406,291
Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Past Due [Line Items]
Past due loans	0
Current loans	2,769,906
Total loans and leases	2,769,906
Non-PCI Loans | Consumer
Financing Receivable, Past Due [Line Items]
Past due loans	102,034	122,944
Current loans	9,548,742	9,648,089
Total loans and leases	9,650,776	9,771,033
Non-PCI Loans | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	1,862	1,339
Current loans	334,203	346,784
Total loans and leases	336,065	348,123
Non-PCI Loans | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Past due loans	6,306	9,736
Current loans	1,265,280	1,245,666
Total loans and leases	1,271,586	1,255,402
Non-PCI Loans | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	72,535	83,272
Current loans	5,493,491	5,478,414
Total loans and leases	5,566,026	5,561,686
Non-PCI Loans | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	16,356	22,018
Current loans	1,922,066	2,030,836
Total loans and leases	1,938,422	2,052,854
Non-PCI Loans | Consumer | Consumer other
Financing Receivable, Past Due [Line Items]
Past due loans	4,975	6,579
Current loans	533,702	546,389
Total loans and leases	538,677	552,968
PCD Loans
Financing Receivable, Past Due [Line Items]
Past due loans	49,266	55,424
Current loans	383,507	407,458
Total loans and leases	432,773	462,882
30 to 59 Days past due
Financing Receivable, Past Due [Line Items]
Past due loans	90,526	121,499
30 to 59 Days past due | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	266	932
30 to 59 Days past due | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Total loans and leases	4,432	6,825
30 to 59 Days past due | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	34,350	43,218
30 to 59 Days past due | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	6,222	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	277	956
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	13,153	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	5,046	12,370
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due loans	13,284	14,532
30 to 59 Days past due | Non-PCI Loans | Commercial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Past due loans	31,760	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	47,516	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	266	932
30 to 59 Days past due | Non-PCI Loans | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Past due loans	4,432	6,825
30 to 59 Days past due | Non-PCI Loans | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	34,350	43,218
30 to 59 Days past due | Non-PCI Loans | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	6,222	11,977
30 to 59 Days past due | Non-PCI Loans | Consumer | Consumer other
Financing Receivable, Past Due [Line Items]
Past due loans	2,246	3,610
30 to 59 Days past due | PCD Loans
Financing Receivable, Past Due [Line Items]
Past due loans	11,250	18,322
Total loans and leases	11,250	18,322
60 to 89 Days past due
Financing Receivable, Past Due [Line Items]
Past due loans	24,562	26,043
60 to 89 Days past due | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	944	77
60 to 89 Days past due | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,014	1,835
60 to 89 Days past due | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	7,396	8,364
60 to 89 Days past due | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	1,603	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	2,996	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	303	0
60 to 89 Days past due | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due loans	4,771	2,842
60 to 89 Days past due | Non-PCI Loans | Commercial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Past due loans	8,070	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	12,170	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	944	77
60 to 89 Days past due | Non-PCI Loans | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Past due loans	1,014	1,835
60 to 89 Days past due | Non-PCI Loans | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	7,396	8,364
60 to 89 Days past due | Non-PCI Loans | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	1,603	2,626
60 to 89 Days past due | Non-PCI Loans | Consumer | Consumer other
Financing Receivable, Past Due [Line Items]
Past due loans	1,213	1,464
60 to 89 Days past due | PCD Loans
Financing Receivable, Past Due [Line Items]
Past due loans	4,322	6,076
Total loans and leases	4,322	6,076
90 Days or greater
Financing Receivable, Past Due [Line Items]
Past due loans	100,831	97,943
90 Days or greater | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans and leases	652	330
90 Days or greater | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Total loans and leases	860	1,076
90 Days or greater | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	30,789	31,690
90 Days or greater | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Total loans and leases	8,531	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	1,595	1,603
90 Days or greater | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	11,028	14,082
90 Days or greater | Non-PCI Loans | Commercial | Non-owner occupied commercial mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	8,917	5,973
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due loans	3,249	3,243
90 Days or greater | Non-PCI Loans | Commercial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Past due loans	24,789	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	42,348	42,016
90 Days or greater | Non-PCI Loans | Consumer | Construction and land development
Financing Receivable, Past Due [Line Items]
Past due loans	652	330
90 Days or greater | Non-PCI Loans | Consumer | Consumer auto
Financing Receivable, Past Due [Line Items]
Past due loans	860	1,076
90 Days or greater | Non-PCI Loans | Consumer | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	30,789	31,690
90 Days or greater | Non-PCI Loans | Consumer | Revolving mortgage
Financing Receivable, Past Due [Line Items]
Past due loans	8,531	7,415
90 Days or greater | Non-PCI Loans | Consumer | Consumer other
Financing Receivable, Past Due [Line Items]
Past due loans	1,516	1,505
90 Days or greater | PCD Loans
Financing Receivable, Past Due [Line Items]
Past due loans	33,694	31,026
Total loans and leases	$ 33,694	$ 31,026