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Loans and Leases (Composition of the Loans and Leases Outstanding by Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | $ 32,791,975 | $ 28,881,496
Past Due | 245,485 | 272,770
Current | 32,546,490 | 28,608,726
30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 121,499 | 136,220
60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 26,043 | 51,058
90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 97,943 | 85,492
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 22,558,060 | 18,836,331
Commercial | Pass |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 18,306,067
Commercial | Special mention |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 211,156
Commercial | Substandard |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 246,867
Commercial | Doubtful |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 3,660
Commercial | Ungraded |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 68,581
Consumer Portfolio Segment |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 9,771,033 | 10,045,165
Current |  | 9,879,384
Consumer Portfolio Segment | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 80,790
Consumer Portfolio Segment | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 31,329
Consumer Portfolio Segment | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 53,662
Construction and land development | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 985,424 |
Construction and land development | Commercial | Pass |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 970,865 |
Construction and land development | Commercial | Special mention |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 12,162 |
Construction and land development | Commercial | Substandard |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 2,397 |
Construction and land development | Consumer Portfolio Segment |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 348,123 |
Construction and land development | Consumer Portfolio Segment | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 932 |
Construction and land development | Consumer Portfolio Segment | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 77 |
Construction and land development | Consumer Portfolio Segment | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 330 |
Commercial and industrial | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 5,013,644 |
Commercial and industrial | Commercial | Pass |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 4,846,634 |
Commercial and industrial | Commercial | Special mention |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 50,429 |
Commercial and industrial | Commercial | Substandard |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 60,249 |
Commercial and industrial | Commercial | Ungraded |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 56,332 |
Non-PCI Loans | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 18,552,002
Past Due |  | 74,146
Current |  | 18,477,856
Non-PCI Loans | Commercial | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 42,716
Non-PCI Loans | Commercial | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 14,553
Non-PCI Loans | Commercial | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 16,877
Non-PCI Loans | Consumer Portfolio Segment |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 9,771,033 | 9,770,778
Past Due | 122,944 | 132,389
Current | 9,648,089 | 9,638,389
Non-PCI Loans | Consumer Portfolio Segment | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 66,562 | 67,026
Non-PCI Loans | Consumer Portfolio Segment | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 14,366 | 25,721
Non-PCI Loans | Consumer Portfolio Segment | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 42,016 | 39,642
Non-PCI Loans | Construction and land development | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 985,424 | 1,013,454
Past Due | 3,086 | 6,043
Current | 982,338 | 1,007,411
Non-PCI Loans | Construction and land development | Commercial | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 956 | 3,146
Non-PCI Loans | Construction and land development | Commercial | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 527 | 195
Non-PCI Loans | Construction and land development | Commercial | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,603 | 2,702
Non-PCI Loans | Construction and land development | Commercial | Pass |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 1,004,922
Non-PCI Loans | Construction and land development | Commercial | Special mention |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 2,577
Non-PCI Loans | Construction and land development | Commercial | Substandard |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 5,955
Non-PCI Loans | Construction and land development | Commercial | Doubtful |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 0
Non-PCI Loans | Construction and land development | Commercial | Ungraded |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 0
Non-PCI Loans | Construction and land development | Consumer Portfolio Segment |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 348,123 | 357,385
Past Due | 1,339 | 2,992
Current | 346,784 | 354,393
Non-PCI Loans | Construction and land development | Consumer Portfolio Segment | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 932 | 977
Non-PCI Loans | Construction and land development | Consumer Portfolio Segment | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 77 | 218
Non-PCI Loans | Construction and land development | Consumer Portfolio Segment | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 330 | 1,797
Non-PCI Loans | Mortgage | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 12,282,635
Past Due |  | 37,482
Current |  | 12,245,153
Non-PCI Loans | Mortgage | Commercial | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 20,389
Non-PCI Loans | Mortgage | Commercial | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 8,774
Non-PCI Loans | Mortgage | Commercial | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 8,319
Non-PCI Loans | Mortgage | Commercial | Pass |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 12,050,799
Non-PCI Loans | Mortgage | Commercial | Special mention |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 115,164
Non-PCI Loans | Mortgage | Commercial | Substandard |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 116,672
Non-PCI Loans | Mortgage | Commercial | Doubtful |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 0
Non-PCI Loans | Mortgage | Commercial | Ungraded |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 0
Non-PCI Loans | Mortgage | Consumer Portfolio Segment |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 5,293,917
Current |  | 5,205,380
Non-PCI Loans | Mortgage | Consumer Portfolio Segment | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 45,839
Non-PCI Loans | Mortgage | Consumer Portfolio Segment | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 18,289
Non-PCI Loans | Mortgage | Consumer Portfolio Segment | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 24,409
Non-PCI Loans | Other commercial real estate | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 542,028
Past Due |  | 1,890
Current |  | 540,138
Non-PCI Loans | Other commercial real estate | Commercial | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 861
Non-PCI Loans | Other commercial real estate | Commercial | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 331
Non-PCI Loans | Other commercial real estate | Commercial | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 698
Non-PCI Loans | Other commercial real estate | Commercial | Pass |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 536,682
Non-PCI Loans | Other commercial real estate | Commercial | Special mention |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 3,899
Non-PCI Loans | Other commercial real estate | Commercial | Substandard |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 1,447
Non-PCI Loans | Other commercial real estate | Commercial | Doubtful |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 0
Non-PCI Loans | Other commercial real estate | Commercial | Ungraded |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 0
Non-PCI Loans | Commercial and industrial | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 5,013,644 | 4,403,792
Past Due | 20,617 | 28,143
Current | 4,993,027 | 4,375,649
Non-PCI Loans | Commercial and industrial | Commercial | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 14,532 | 18,269
Non-PCI Loans | Commercial and industrial | Commercial | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2,842 | 4,842
Non-PCI Loans | Commercial and industrial | Commercial | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3,243 | 5,032
Non-PCI Loans | Commercial and industrial | Commercial | Pass |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 4,256,456
Non-PCI Loans | Commercial and industrial | Commercial | Special mention |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 44,604
Non-PCI Loans | Commercial and industrial | Commercial | Substandard |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 34,148
Non-PCI Loans | Commercial and industrial | Commercial | Doubtful |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 3
Non-PCI Loans | Commercial and industrial | Commercial | Ungraded |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 68,581
Non-PCI Loans | Other | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 22,558,060 | 310,093
Past Due | 67,117 | 588
Current | 22,490,943 | 309,505
Non-PCI Loans | Other | Commercial | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 36,615 | 51
Non-PCI Loans | Other | Commercial | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 5,601 | 411
Non-PCI Loans | Other | Commercial | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 24,901 | 126
Non-PCI Loans | Other | Commercial | Pass |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 308,796
Non-PCI Loans | Other | Commercial | Special mention |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 622
Non-PCI Loans | Other | Commercial | Substandard |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 675
Non-PCI Loans | Other | Commercial | Doubtful |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 0
Non-PCI Loans | Other | Commercial | Ungraded |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 0
Non-PCI Loans | Revolving mortgage | Consumer Portfolio Segment |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 2,339,072
Current |  | 2,316,010
Non-PCI Loans | Revolving mortgage | Consumer Portfolio Segment | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 9,729
Non-PCI Loans | Revolving mortgage | Consumer Portfolio Segment | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 3,468
Non-PCI Loans | Revolving mortgage | Consumer Portfolio Segment | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 9,865
Non-PCI Loans | Consumer | Consumer Portfolio Segment |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 1,780,404
Past Due |  | 17,798
Current |  | 1,762,606
Non-PCI Loans | Consumer | Consumer Portfolio Segment | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 10,481
Non-PCI Loans | Consumer | Consumer Portfolio Segment | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 3,746
Non-PCI Loans | Consumer | Consumer Portfolio Segment | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 3,571
PCD Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 462,882 | 558,716
Past Due | 55,424 | 66,235
Current | 407,458 | 492,481
PCD Loans | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 18,322 |
Past Due | 18,322 | 26,478
PCD Loans | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 6,076 |
Past Due | 6,076 | 10,784
PCD Loans | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases | 31,026 |
Past Due | $ 31,026 | 28,973
PCD Loans | Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 284,329
PCD Loans | Commercial | Pass |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 148,412
PCD Loans | Commercial | Special mention |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 44,290
PCD Loans | Commercial | Substandard |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 87,970
PCD Loans | Commercial | Doubtful |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 3,657
PCD Loans | Commercial | Ungraded |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 0
PCD Loans | Consumer Portfolio Segment |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans and leases |  | 274,387
Current |  | 240,995
PCD Loans | Consumer Portfolio Segment | 30-59 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 13,764
PCD Loans | Consumer Portfolio Segment | 60-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | 5,608
PCD Loans | Consumer Portfolio Segment | 90 days or greater |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  | $ 14,020

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