Loans and Leases (Aging Of The Outstanding Loans and Leases By Class Excluding Loans Impaired At Acquisition Date) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	$ 32,371,522	$ 32,791,975
SBA-PPP
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	493,800	2,410,000
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	22,280,288	22,558,060
Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,111,797	985,424
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,710,652	5,013,644
Commercial | Mortgage Receivable, Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	11,992,625	11,165,012
Commercial | Mortgage Receivable, Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,971,393	2,987,689
Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	9,753,610	9,771,033
Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	399,570	348,123
Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,679,919	5,561,686
Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,795,005	2,052,854
Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,331,388	1,255,402
Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	547,728	552,968
Non-PCI Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		22,558,060
Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,111,797	985,424
Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		11,165,012
Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		2,987,689
Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,710,652	5,013,644
Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	493,821
Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	22,280,288	2,406,291
Non-PCI Loans | Commercial | Mortgage Receivable, Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	11,992,625
Non-PCI Loans | Commercial | Mortgage Receivable, Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,971,393
Non-PCI Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	9,753,610	9,771,033
Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	399,570	348,123
Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,679,919	5,561,686
Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,795,005	2,052,854
Non-PCI Loans | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,331,388	1,255,402
Non-PCI Loans | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	547,728
Non-PCI Loans | Consumer Portfolio Segment | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		552,968
PCD Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	337,624	462,882
30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	71,053	121,499
30-59 days past due | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	388	932
30-59 days past due | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	18,585	43,218
30-59 days past due | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,446	11,977
30-59 days past due | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,628	6,825
30-59 days past due | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,335	3,610
30-59 days past due | Non-PCI Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		36,615
30-59 days past due | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	456	956
30-59 days past due | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		8,757
30-59 days past due | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		12,370
30-59 days past due | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	7,909	14,532
30-59 days past due | Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	0
30-59 days past due | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	27,773	0
30-59 days past due | Non-PCI Loans | Commercial | Mortgage Receivable, Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	18,073
30-59 days past due | Non-PCI Loans | Commercial | Mortgage Receivable, Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,335
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	32,382	66,562
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	388	932
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	18,585	43,218
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,446	11,977
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,628	6,825
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,335
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		3,610
30-59 days past due | PCD Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	10,898	18,322
60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	16,462	26,043
60-89 days past due | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	0	77
60-89 days past due | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	4,066	8,364
60-89 days past due | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,086	2,626
60-89 days past due | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,134	1,835
60-89 days past due | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,013	1,464
60-89 days past due | Non-PCI Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		5,601
60-89 days past due | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	0	527
60-89 days past due | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		2,232
60-89 days past due | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		0
60-89 days past due | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	3,714	2,842
60-89 days past due | Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	0
60-89 days past due | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	4,264	0
60-89 days past due | Non-PCI Loans | Commercial | Mortgage Receivable, Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	517
60-89 days past due | Non-PCI Loans | Commercial | Mortgage Receivable, Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	33
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	9,299	14,366
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	0	77
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	4,066	8,364
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,086	2,626
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,134	1,835
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,013
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		1,464
60-89 days past due | PCD Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,899	6,076
90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	51,869	97,943
90 days or greater | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	41	330
90 days or greater | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	14,205	31,690
90 days or greater | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	4,612	7,415
90 days or greater | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,214	1,076
90 days or greater | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,154	1,505
90 days or greater | Non-PCI Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		24,901
90 days or greater | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,099	1,603
90 days or greater | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		14,082
90 days or greater | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		5,973
90 days or greater | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	6,238	3,243
90 days or greater | Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	0
90 days or greater | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	17,483	0
90 days or greater | Non-PCI Loans | Commercial | Mortgage Receivable, Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	6,929
90 days or greater | Non-PCI Loans | Commercial | Mortgage Receivable, Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,217
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	21,226	42,016
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	41	330
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	14,205	31,690
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	4,612	7,415
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,214	1,076
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,154
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		1,505
90 days or greater | PCD Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	13,160	31,026
Total past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	139,384	245,485
Total past due | Non-PCI Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		67,117
Total past due | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,555	3,086
Total past due | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		25,071
Total past due | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		18,343
Total past due | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	17,861	20,617
Total past due | Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	0
Total past due | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	49,520	0
Total past due | Non-PCI Loans | Commercial | Mortgage Receivable, Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	25,519
Total past due | Non-PCI Loans | Commercial | Mortgage Receivable, Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	3,585
Total past due | Non-PCI Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	62,907	122,944
Total past due | Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	429	1,339
Total past due | Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	36,856	83,272
Total past due | Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	12,144	22,018
Total past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	7,976	9,736
Total past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,502
Total past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		6,579
Total past due | PCD Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	26,957	55,424
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	32,232,138	32,546,490
Current | Non-PCI Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		22,490,943
Current | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,109,242	982,338
Current | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		11,139,941
Current | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		2,969,346
Current | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,692,791	4,993,027
Current | Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	493,821
Current | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	22,230,768	2,406,291
Current | Non-PCI Loans | Commercial | Mortgage Receivable, Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	11,967,106
Current | Non-PCI Loans | Commercial | Mortgage Receivable, Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,967,808
Current | Non-PCI Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	9,690,703	9,648,089
Current | Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	399,141	346,784
Current | Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,643,063	5,478,414
Current | Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,782,861	2,030,836
Current | Non-PCI Loans | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,323,412	1,245,666
Current | Non-PCI Loans | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	542,226
Current | Non-PCI Loans | Consumer Portfolio Segment | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		546,389
Current | PCD Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	$ 310,667	$ 407,458