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Loans and Allowance for Loan Losses - Impaired loans by loan class (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment     $ 97,435
Individually evaluated impaired loans with no recorded allowance, unpaid principal balance     104,277
Individually evaluated impaired loans with a recorded allowance, recorded investment     388,609
Individually evaluated impaired loans with a recorded allowance, unpaid principal balance     455,162
Individually evaluated impaired loans with a recorded allowance, allowance     126,832
Individually evaluated impaired loans, average recorded investment $ 559,560 $ 618,116  
Individually evaluated impaired loans, interest income recognized 1,944 6,310  
Commercial, Financial and Agricultural      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment     51,203
Individually evaluated impaired loans with no recorded allowance, unpaid principal balance     52,991
Individually evaluated impaired loans with a recorded allowance, recorded investment     187,450
Individually evaluated impaired loans with a recorded allowance, unpaid principal balance     249,486
Individually evaluated impaired loans with a recorded allowance, allowance     88,164
Individually evaluated impaired loans, average recorded investment 318,790 377,390  
Individually evaluated impaired loans, interest income recognized 496 2,033  
Commercial Real Estate | Real estate – construction      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment     0
Individually evaluated impaired loans with no recorded allowance, unpaid principal balance     0
Individually evaluated impaired loans with a recorded allowance, recorded investment     5,972
Individually evaluated impaired loans with a recorded allowance, unpaid principal balance     5,979
Individually evaluated impaired loans with a recorded allowance, allowance     850
Individually evaluated impaired loans, average recorded investment 584 436  
Individually evaluated impaired loans, interest income recognized 2 6  
Commercial Real Estate | Commercial real estate – mortgage      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment     46,232
Individually evaluated impaired loans with no recorded allowance, unpaid principal balance     51,286
Individually evaluated impaired loans with a recorded allowance, recorded investment     26,097
Individually evaluated impaired loans with a recorded allowance, unpaid principal balance     27,757
Individually evaluated impaired loans with a recorded allowance, allowance     12,405
Individually evaluated impaired loans, average recorded investment 77,165 79,910  
Individually evaluated impaired loans, interest income recognized 221 687  
Residential Real Estate | Residential real estate – mortgage      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment     0
Individually evaluated impaired loans with no recorded allowance, unpaid principal balance     0
Individually evaluated impaired loans with a recorded allowance, recorded investment     111,623
Individually evaluated impaired loans with a recorded allowance, unpaid principal balance     111,623
Individually evaluated impaired loans with a recorded allowance, allowance     8,974
Individually evaluated impaired loans, average recorded investment 109,450 107,456  
Individually evaluated impaired loans, interest income recognized 691 2,021  
Residential Real Estate | Equity lines of credit      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment     0
Individually evaluated impaired loans with no recorded allowance, unpaid principal balance     0
Individually evaluated impaired loans with a recorded allowance, recorded investment     15,466
Individually evaluated impaired loans with a recorded allowance, unpaid principal balance     15,472
Individually evaluated impaired loans with a recorded allowance, allowance     10,896
Individually evaluated impaired loans, average recorded investment 16,553 15,617  
Individually evaluated impaired loans, interest income recognized 164 514  
Residential Real Estate | Equity loans      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment     0
Individually evaluated impaired loans with no recorded allowance, unpaid principal balance     0
Individually evaluated impaired loans with a recorded allowance, recorded investment     28,639
Individually evaluated impaired loans with a recorded allowance, unpaid principal balance     29,488
Individually evaluated impaired loans with a recorded allowance, allowance     2,905
Individually evaluated impaired loans, average recorded investment 29,455 30,568  
Individually evaluated impaired loans, interest income recognized 268 816  
Consumer | Credit card      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment     0
Individually evaluated impaired loans with no recorded allowance, unpaid principal balance     0
Individually evaluated impaired loans with a recorded allowance, recorded investment     0
Individually evaluated impaired loans with a recorded allowance, unpaid principal balance     0
Individually evaluated impaired loans with a recorded allowance, allowance     0
Individually evaluated impaired loans, average recorded investment 0 0  
Individually evaluated impaired loans, interest income recognized 0 0  
Consumer | Consumer direct      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment     0
Individually evaluated impaired loans with no recorded allowance, unpaid principal balance     0
Individually evaluated impaired loans with a recorded allowance, recorded investment     11,601
Individually evaluated impaired loans with a recorded allowance, unpaid principal balance     13,596
Individually evaluated impaired loans with a recorded allowance, allowance     1,903
Individually evaluated impaired loans, average recorded investment 7,360 6,459  
Individually evaluated impaired loans, interest income recognized 102 233  
Consumer | Consumer indirect      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment     0
Individually evaluated impaired loans with no recorded allowance, unpaid principal balance     0
Individually evaluated impaired loans with a recorded allowance, recorded investment     1,761
Individually evaluated impaired loans with a recorded allowance, unpaid principal balance     1,761
Individually evaluated impaired loans with a recorded allowance, allowance     $ 735
Individually evaluated impaired loans, average recorded investment 203 280  
Individually evaluated impaired loans, interest income recognized $ 0 $ 0