Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Rating) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 32,791,975	$ 28,881,496
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	8,459,531
2019	4,217,219
2018	2,787,346
2017	2,053,335
2016	1,647,878
Prior	2,238,335
Revolving	1,147,519
Revolving converted to term loans	6,897
Total loans and leases	22,558,060	18,836,331
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	342,658
2019	341,862
2018	198,300
2017	56,118
2016	23,977
Prior	11,387
Revolving	11,122
Revolving converted to term loans	0
Total loans and leases	985,424
Commercial | Mortgage Receivable, Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	3,200,021
2019	2,240,919
2018	1,671,722
2017	1,334,727
2016	1,081,293
Prior	1,521,016
Revolving	115,109
Revolving converted to term loans	205
Total loans and leases	11,165,012
Commercial | Mortgage Receivable, Non-Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	868,982
2019	629,426
2018	401,226
2017	342,372
2016	302,018
Prior	410,223
Revolving	33,442
Revolving converted to term loans	0
Total loans and leases	2,987,689
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,641,579
2019	1,005,012
2018	516,098
2017	320,118
2016	240,590
Prior	295,709
Revolving	987,846
Revolving converted to term loans	6,692
Total loans and leases	5,013,644
Commercial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		18,306,067
Commercial | Pass | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	342,183
2019	341,233
2018	190,429
2017	50,776
2016	23,969
Prior	11,306
Revolving	10,969
Revolving converted to term loans	0
Total loans and leases	970,865
Commercial | Pass | Mortgage Receivable, Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	3,183,467
2019	2,201,165
2018	1,625,141
2017	1,301,412
2016	1,049,858
Prior	1,454,020
Revolving	101,556
Revolving converted to term loans	133
Total loans and leases	10,916,752
Commercial | Pass | Mortgage Receivable, Non-Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	865,514
2019	609,975
2018	378,136
2017	331,800
2016	282,810
Prior	391,517
Revolving	32,149
Revolving converted to term loans	0
Total loans and leases	2,891,901
Commercial | Pass | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,620,622
2019	983,852
2018	504,463
2017	310,468
2016	234,735
Prior	286,996
Revolving	899,978
Revolving converted to term loans	5,520
Total loans and leases	4,846,634
Commercial | Pass | SBA-PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	2,406,291
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Revolving converted to term loans	0
Total loans and leases	2,406,291
Commercial | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		211,156
Commercial | Special mention | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	246
2019	0
2018	6,421
2017	5,342
2016	0
Prior	0
Revolving	153
Revolving converted to term loans	0
Total loans and leases	12,162
Commercial | Special mention | Mortgage Receivable, Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	6,274
2019	20,702
2018	36,739
2017	12,387
2016	17,699
Prior	25,693
Revolving	5,115
Revolving converted to term loans	72
Total loans and leases	124,681
Commercial | Special mention | Mortgage Receivable, Non-Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	569
2019	905
2018	10,794
2017	1,808
2016	5,121
Prior	3,279
Revolving	483
Revolving converted to term loans	0
Total loans and leases	22,959
Commercial | Special mention | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	3,146
2019	17,065
2018	7,265
2017	5,393
2016	3,307
Prior	4,912
Revolving	9,152
Revolving converted to term loans	189
Total loans and leases	50,429
Commercial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		246,867
Commercial | Substandard | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	229
2019	629
2018	1,450
2017	0
2016	8
Prior	81
Revolving	0
Revolving converted to term loans	0
Total loans and leases	2,397
Commercial | Substandard | Mortgage Receivable, Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	10,280
2019	19,052
2018	9,842
2017	20,928
2016	13,736
Prior	41,303
Revolving	8,438
Revolving converted to term loans	0
Total loans and leases	123,579
Commercial | Substandard | Mortgage Receivable, Non-Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	2,899
2019	18,546
2018	12,296
2017	8,764
2016	14,087
Prior	15,427
Revolving	810
Revolving converted to term loans	0
Total loans and leases	72,829
Commercial | Substandard | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	17,811
2019	4,095
2018	4,370
2017	4,257
2016	2,548
Prior	3,801
Revolving	22,384
Revolving converted to term loans	983
Total loans and leases	60,249
Commercial | Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		68,581
Commercial | Ungraded | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	56,332
Revolving converted to term loans	0
Total loans and leases	56,332
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	2,679,097
2019	1,444,947
2018	929,030
2017	728,918
2016	536,569
Prior	951,150
Revolving	2,339,505
Revolving converted to term loans	161,817
Total loans and leases	9,771,033	10,045,165
Consumer Portfolio Segment | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	215,112
2019	86,127
2018	24,981
2017	10,648
2016	6,093
Prior	2,637
Revolving	2,525
Revolving converted to term loans	0
Total loans and leases	348,123
Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,885,273
2019	987,802
2018	671,657
2017	605,545
2016	476,855
Prior	909,361
Revolving	25,193
Revolving converted to term loans	0
Total loans and leases	5,561,686
Consumer Portfolio Segment | Revolving Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	1,891,037
Revolving converted to term loans	161,817
Total loans and leases	2,052,854
Consumer Portfolio Segment | Consumer Auto Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	524,393
2019	343,683
2018	221,383
2017	105,530
2016	50,627
Prior	9,786
Revolving	0
Revolving converted to term loans	0
Total loans and leases	1,255,402
Consumer Portfolio Segment | Consumer Loan, Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	54,319
2019	27,335
2018	11,009
2017	7,195
2016	2,994
Prior	29,366
Revolving	420,750
Revolving converted to term loans	0
Total loans and leases	552,968
Consumer And PCD Portfolio Segments
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	11,172,270
2019	5,690,922
2018	3,749,427
2017	2,812,829
2016	2,215,777
Prior	3,458,369
Revolving	3,500,512
Revolving converted to term loans	191,869
Total loans and leases	32,791,975
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	33,642
2019	28,756
2018	33,051
2017	30,576
2016	31,330
Prior	268,884
Revolving	13,488
Revolving converted to term loans	23,155
Total loans and leases	462,882	558,716
PCD Loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		284,329
PCD Loans | Commercial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		148,412
PCD Loans | Commercial | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		44,290
PCD Loans | Commercial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		87,970
PCD Loans | Commercial | Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		0
PCD Loans | Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		$ 274,387
Current | Consumer Portfolio Segment | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	215,112
2019	85,707
2018	24,860
2017	10,269
2016	6,093
Prior	2,218
Revolving	2,525
Revolving converted to term loans	0
Total loans and leases	346,784
Current | Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,882,683
2019	978,298
2018	655,798
2017	596,309
2016	461,719
Prior	878,634
Revolving	24,973
Revolving converted to term loans	0
Total loans and leases	5,478,414
Current | Consumer Portfolio Segment | Revolving Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	1,879,968
Revolving converted to term loans	150,868
Total loans and leases	2,030,836
Current | Consumer Portfolio Segment | Consumer Auto Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	521,719
2019	340,594
2018	219,597
2017	104,280
2016	49,872
Prior	9,604
Revolving	0
Revolving converted to term loans	0
Total loans and leases	1,245,666
Current | Consumer Portfolio Segment | Consumer Loan, Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	53,842
2019	27,117
2018	10,911
2017	7,159
2016	2,980
Prior	29,336
Revolving	415,044
Revolving converted to term loans	0
Total loans and leases	546,389
Current | PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	31,475
2019	25,425
2018	27,183
2017	27,955
2016	28,995
Prior	232,186
Revolving	13,212
Revolving converted to term loans	21,027
Total loans and leases	407,458
30-59 days past due | Consumer Portfolio Segment | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	420
2018	121
2017	370
2016	0
Prior	21
Revolving	0
Revolving converted to term loans	0
Total loans and leases	932
30-59 days past due | Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	2,278
2019	4,573
2018	11,463
2017	3,772
2016	8,613
Prior	12,299
Revolving	220
Revolving converted to term loans	0
Total loans and leases	43,218
30-59 days past due | Consumer Portfolio Segment | Revolving Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	8,241
Revolving converted to term loans	3,736
Total loans and leases	11,977
30-59 days past due | Consumer Portfolio Segment | Consumer Auto Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	2,175
2019	1,873
2018	1,257
2017	842
2016	544
Prior	134
Revolving	0
Revolving converted to term loans	0
Total loans and leases	6,825
30-59 days past due | Consumer Portfolio Segment | Consumer Loan, Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	322
2019	114
2018	77
2017	18
2016	11
Prior	7
Revolving	3,061
Revolving converted to term loans	0
Total loans and leases	3,610
30-59 days past due | PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	999
2019	925
2018	801
2017	718
2016	1,341
Prior	12,637
Revolving	156
Revolving converted to term loans	745
Total loans and leases	18,322
60-89 days past due | Consumer Portfolio Segment | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	9
2016	0
Prior	68
Revolving	0
Revolving converted to term loans	0
Total loans and leases	77
60-89 days past due | Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	30
2019	100
2018	1,246
2017	1,449
2016	834
Prior	4,705
Revolving	0
Revolving converted to term loans	0
Total loans and leases	8,364
60-89 days past due | Consumer Portfolio Segment | Revolving Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	527
Revolving converted to term loans	2,099
Total loans and leases	2,626
60-89 days past due | Consumer Portfolio Segment | Consumer Auto Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	329
2019	689
2018	312
2017	351
2016	109
Prior	45
Revolving	0
Revolving converted to term loans	0
Total loans and leases	1,835
60-89 days past due | Consumer Portfolio Segment | Consumer Loan, Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	102
2019	20
2018	13
2017	18
2016	3
Prior	23
Revolving	1,285
Revolving converted to term loans	0
Total loans and leases	1,464
60-89 days past due | PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	447
2019	81
2018	312
2017	695
2016	97
Prior	4,098
Revolving	9
Revolving converted to term loans	337
Total loans and leases	6,076
90 days or greater | Consumer Portfolio Segment | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	330
Revolving	0
Revolving converted to term loans	0
Total loans and leases	330
90 days or greater | Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	282
2019	4,831
2018	3,150
2017	4,015
2016	5,689
Prior	13,723
Revolving	0
Revolving converted to term loans	0
Total loans and leases	31,690
90 days or greater | Consumer Portfolio Segment | Revolving Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	2,301
Revolving converted to term loans	5,114
Total loans and leases	7,415
90 days or greater | Consumer Portfolio Segment | Consumer Auto Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	170
2019	527
2018	217
2017	57
2016	102
Prior	3
Revolving	0
Revolving converted to term loans	0
Total loans and leases	1,076
90 days or greater | Consumer Portfolio Segment | Consumer Loan, Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	53
2019	84
2018	8
2017	0
2016	0
Prior	0
Revolving	1,360
Revolving converted to term loans	0
Total loans and leases	1,505
90 days or greater | PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	721
2019	2,325
2018	4,755
2017	1,208
2016	897
Prior	19,963
Revolving	111
Revolving converted to term loans	1,046
Total loans and leases	$ 31,026