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Loans and Allowance for Loan Losses - Classified as troubled debt restructurings (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Contract
Mar. 31, 2019
USD ($)
Contract
Commercial, Financial and Agricultural    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Contracts | Contract 10 3
Post-Modification Outstanding Recorded Investment | $ $ 41,238 $ 11,570
Number of subsequent default contracts | Contract 0 0
Recorded investment at subsequent default | $ $ 0 $ 0
Commercial Real Estate | Real estate – construction    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Contracts | Contract 0 0
Post-Modification Outstanding Recorded Investment | $ $ 0 $ 0
Number of subsequent default contracts | Contract 0 0
Recorded investment at subsequent default | $ $ 0 $ 0
Commercial Real Estate | Commercial real estate – mortgage    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Contracts | Contract 2 0
Post-Modification Outstanding Recorded Investment | $ $ 1,740 $ 0
Number of subsequent default contracts | Contract 0 0
Recorded investment at subsequent default | $ $ 0 $ 0
Residential Real Estate | Residential real estate – mortgage    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Contracts | Contract 8 20
Post-Modification Outstanding Recorded Investment | $ $ 844 $ 5,233
Number of subsequent default contracts | Contract 1 0
Recorded investment at subsequent default | $ $ 84 $ 0
Residential Real Estate | Equity lines of credit    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Contracts | Contract 1 0
Post-Modification Outstanding Recorded Investment | $ $ 36 $ 0
Number of subsequent default contracts | Contract 0 0
Recorded investment at subsequent default | $ $ 0 $ 0
Residential Real Estate | Equity loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Contracts | Contract 1 4
Post-Modification Outstanding Recorded Investment | $ $ 192 $ 176
Number of subsequent default contracts | Contract 0 2
Recorded investment at subsequent default | $ $ 0 $ 151
Consumer | Credit card    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Contracts | Contract 0 0
Post-Modification Outstanding Recorded Investment | $ $ 0 $ 0
Number of subsequent default contracts | Contract 0 0
Recorded investment at subsequent default | $ $ 0 $ 0
Consumer | Consumer direct    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Contracts | Contract 89 13
Post-Modification Outstanding Recorded Investment | $ $ 4,762 $ 3,519
Number of subsequent default contracts | Contract 4 2
Recorded investment at subsequent default | $ $ 217 $ 15
Consumer | Consumer indirect    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Contracts | Contract 0 0
Post-Modification Outstanding Recorded Investment | $ $ 0 $ 0
Number of subsequent default contracts | Contract 0 0
Recorded investment at subsequent default | $ $ 0 $ 0