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Allowance for Credit Losses - Impairment By Loan Class (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
loan
Dec. 31, 2023
USD ($)
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment $ 46,232 $ 47,061
Loans Individually Evaluated for Impairment, Allowance 5,820 12,291
Loans Collectively Evaluated for Impairment, Recorded Investment 8,066,249 8,011,900
Loans Collectively Evaluated for Impairment, Allowance $ 136,978 144,778
Commercial, financial and agricultural | Commercial.    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Number of loans downgraded | loan 1  
Commercial, financial and agricultural | Domestic | Commercial.    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment $ 5,445 30,872
Loans Individually Evaluated for Impairment, Allowance 400 7,971
Loans Collectively Evaluated for Impairment, Recorded Investment 1,575,762 1,597,358
Loans Collectively Evaluated for Impairment, Allowance 26,276 27,579
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment 211 299
Loans Collectively Evaluated for Impairment, Recorded Investment 2,810,745 2,793,254
Loans Collectively Evaluated for Impairment, Allowance 39,402 42,703
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment 25,151 96
Loans Collectively Evaluated for Impairment, Recorded Investment 298,455 380,743
Loans Collectively Evaluated for Impairment, Allowance 3,768 5,088
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment 15,366 15,701
Loans Individually Evaluated for Impairment, Allowance 5,420 4,320
Loans Collectively Evaluated for Impairment, Recorded Investment 2,204,066 2,075,921
Loans Collectively Evaluated for Impairment, Allowance 49,677 50,971
Real estate - mortgage | Domestic | Residential: first lien    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Individually Evaluated for Impairment, Recorded Investment 59 93
Loans Collectively Evaluated for Impairment, Recorded Investment 486,729 477,940
Loans Collectively Evaluated for Impairment, Allowance 5,757 5,812
Real estate - mortgage | Domestic | Residential Junior Lien    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Collectively Evaluated for Impairment, Recorded Investment 467,681 460,868
Loans Collectively Evaluated for Impairment, Allowance 10,648 11,024
Consumer | Domestic    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Collectively Evaluated for Impairment, Recorded Investment 46,358 45,121
Loans Collectively Evaluated for Impairment, Allowance 313 318
Foreign. | Foreign    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans Collectively Evaluated for Impairment, Recorded Investment 176,453 180,695
Loans Collectively Evaluated for Impairment, Allowance $ 1,137 $ 1,283