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Loans and Allowance for Loan Losses - Credit quality indicators (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans $ 66,180,612 $ 63,946,857
Commercial, Financial and Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 26,940,173 24,432,238
Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans [1]   15,890,160
Commercial Real Estate | Real estate – construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 2,403,674 2,028,682
Commercial Real Estate | Commercial real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 13,695,800 13,861,478
Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans [2]   16,371,602
Residential Real Estate | Residential real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 13,463,757 13,533,954
Residential Real Estate | Equity lines of credit    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 2,441,723 2,592,680
Residential Real Estate | Equity loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 194,367 244,968
Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans [3]   7,252,857
Consumer | Credit card    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 907,793 1,002,365
Consumer | Consumer direct    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 2,023,696 2,338,142
Consumer | Consumer indirect    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 4,109,629 3,912,350
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 43,039,647 40,322,398
Commercial | Commercial, Financial and Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 4,643,292  
2019 3,026,503  
2018 2,750,022  
2017 3,059,521  
2016 1,132,887  
Prior 3,583,742  
Recorded Investment of Revolving Loans 8,744,206  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 26,940,173  
Loans 26,940,173 24,432,238
Commercial | Commercial, Financial and Agricultural | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 4,572,407  
2019 2,978,677  
2018 2,607,424  
2017 2,926,530  
2016 1,067,416  
Prior 3,431,190  
Recorded Investment of Revolving Loans 7,991,155  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 25,574,799  
Loans   23,319,645
Commercial | Commercial, Financial and Agricultural | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 48,114  
2019 27,997  
2018 64,487  
2017 50,861  
2016 25,958  
Prior 55,495  
Recorded Investment of Revolving Loans 357,594  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 630,506  
Loans   543,928
Commercial | Commercial, Financial and Agricultural | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 22,771  
2019 19,829  
2018 47,314  
2017 57,440  
2016 31,907  
Prior 83,181  
Recorded Investment of Revolving Loans 381,100  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 643,542  
Loans   488,813
Commercial | Commercial, Financial and Agricultural | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 30,797  
2017 24,690  
2016 7,606  
Prior 13,876  
Recorded Investment of Revolving Loans 14,357  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 91,326  
Loans   79,852
Commercial | Commercial Real Estate | Real estate – construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 157,825  
2019 731,038  
2018 757,555  
2017 387,906  
2016 115,918  
Prior 84,547  
Recorded Investment of Revolving Loans 168,885  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 2,403,674  
Loans 2,403,674 2,028,682
Commercial | Commercial Real Estate | Commercial real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,103,112  
2019 3,140,952  
2018 3,798,037  
2017 1,733,872  
2016 1,056,977  
Prior 2,633,572  
Recorded Investment of Revolving Loans 229,278  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 13,695,800  
Loans 13,695,800 13,861,478
Commercial | Commercial Real Estate | Pass | Real estate – construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 157,825  
2019 724,378  
2018 750,181  
2017 368,924  
2016 108,282  
Prior 79,430  
Recorded Investment of Revolving Loans 168,885  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 2,357,905  
Loans   1,979,310
Commercial | Commercial Real Estate | Pass | Commercial real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,099,683  
2019 3,112,582  
2018 3,675,597  
2017 1,667,937  
2016 1,008,139  
Prior 2,479,403  
Recorded Investment of Revolving Loans 219,460  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 13,262,801  
Loans   13,547,273
Commercial | Commercial Real Estate | Special Mention | Real estate – construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 18,982  
2016 1,532  
Prior 454  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 20,968  
Loans   67
Commercial | Commercial Real Estate | Special Mention | Commercial real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2,854  
2019 27,804  
2018 110,568  
2017 4,164  
2016 25,520  
Prior 37,157  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 208,067  
Loans   168,679
Commercial | Commercial Real Estate | Substandard | Real estate – construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 6,660  
2018 7,374  
2017 0  
2016 6,104  
Prior 4,663  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 24,801  
Loans   49,305
Commercial | Commercial Real Estate | Substandard | Commercial real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 575  
2019 566  
2018 11,872  
2017 61,771  
2016 23,318  
Prior 114,042  
Recorded Investment of Revolving Loans 9,818  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 221,962  
Loans   134,420
Commercial | Commercial Real Estate | Doubtful | Real estate – construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 0  
Loans   0
Commercial | Commercial Real Estate | Doubtful | Commercial real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 2,970  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 2,970  
Loans   11,106
Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans 23,140,965 23,624,459
Consumer | Residential Real Estate | Residential real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,775,087  
2019 2,375,699  
2018 1,194,417  
2017 1,265,474  
2016 1,392,519  
Prior 5,460,561  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 13,463,757  
Loans 13,463,757 13,533,954
Consumer | Residential Real Estate | Equity lines of credit    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Recorded Investment of Revolving Loans 2,438,056  
Recorded Investment of Revolving Loans Converted to Term Loans 3,667  
Total 2,441,723  
Loans 2,441,723 2,592,680
Consumer | Residential Real Estate | Equity loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,731  
2019 13,212  
2018 11,162  
2017 4,911  
2016 3,924  
Prior 157,427  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 194,367  
Loans 194,367 244,968
Consumer | Residential Real Estate | Performing | Residential real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,774,759  
2019 2,373,282  
2018 1,184,954  
2017 1,244,319  
2016 1,375,615  
Prior 5,266,254  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 13,219,183  
Loans   13,381,709
Consumer | Residential Real Estate | Performing | Equity lines of credit    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Recorded Investment of Revolving Loans 2,397,594  
Recorded Investment of Revolving Loans Converted to Term Loans 3,468  
Total 2,401,062  
Loans   2,553,000
Consumer | Residential Real Estate | Performing | Equity loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,717  
2019 13,212  
2018 10,689  
2017 4,748  
2016 3,924  
Prior 148,622  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 184,912  
Loans   236,122
Consumer | Residential Real Estate | Nonperforming | Residential real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 328  
2019 2,417  
2018 9,463  
2017 21,155  
2016 16,904  
Prior 194,307  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 244,574  
Loans   152,245
Consumer | Residential Real Estate | Nonperforming | Equity lines of credit    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Recorded Investment of Revolving Loans 40,462  
Recorded Investment of Revolving Loans Converted to Term Loans 199  
Total 40,661  
Loans   39,680
Consumer | Residential Real Estate | Nonperforming | Equity loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 14  
2019 0  
2018 473  
2017 163  
2016 0  
Prior 8,805  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 9,455  
Loans   8,846
Consumer | Consumer | Credit card    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Recorded Investment of Revolving Loans 907,793  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 907,793  
Loans 907,793 1,002,365
Consumer | Consumer | Consumer direct    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 352,226  
2019 571,999  
2018 477,965  
2017 135,560  
2016 63,078  
Prior 24,530  
Recorded Investment of Revolving Loans 398,338  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 2,023,696  
Loans 2,023,696 2,338,142
Consumer | Consumer | Consumer indirect    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,011,342  
2019 1,407,378  
2018 990,315  
2017 418,345  
2016 140,386  
Prior 141,863  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 4,109,629  
Loans 4,109,629 3,912,350
Consumer | Consumer | Performing | Credit card    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Recorded Investment of Revolving Loans 891,251  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 891,251  
Loans   979,569
Consumer | Consumer | Performing | Consumer direct    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 352,071  
2019 568,277  
2018 470,073  
2017 133,739  
2016 62,502  
Prior 24,366  
Recorded Investment of Revolving Loans 396,891  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 2,007,919  
Loans   2,313,082
Consumer | Consumer | Performing | Consumer indirect    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,010,830  
2019 1,402,703  
2018 980,220  
2017 411,866  
2016 136,671  
Prior 138,551  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 4,080,841  
Loans   3,870,839
Consumer | Consumer | Nonperforming | Credit card    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Recorded Investment of Revolving Loans 16,542  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 16,542  
Loans   22,796
Consumer | Consumer | Nonperforming | Consumer direct    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 155  
2019 3,722  
2018 7,892  
2017 1,821  
2016 576  
Prior 164  
Recorded Investment of Revolving Loans 1,447  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total 15,777  
Loans   25,060
Consumer | Consumer | Nonperforming | Consumer indirect    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 512  
2019 4,675  
2018 10,095  
2017 6,479  
2016 3,715  
Prior 3,312  
Recorded Investment of Revolving Loans 0  
Recorded Investment of Revolving Loans Converted to Term Loans 0  
Total $ 28,788  
Loans   $ 41,511
[1] Includes commercial real estate – mortgage and real estate – construction loans.
[2] Includes residential real estate – mortgage, equity lines of credit and equity loans.
[3] Includes credit card, consumer direct and consumer indirect loans.