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Loans - Schedule Of Acquired Purchase Credit Impaired Loans By Portfolio Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance - purchased credit-impaired loans $ 1,965 $ 4,037 $ 3,168
Provision for loan losses 47,000 7,000 0
Carrying value 54,221 86,420  
Unpaid balance 58,216 98,190  
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance - purchased credit-impaired loans 848 2,823  
PCI Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance - purchased credit-impaired loans 2,000 4,000  
Net charge-off 5,800 6,700  
Provision for loan losses 1,300 4,800  
Commercial, financial, and industrial | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance - purchased credit-impaired loans 848 2,823 2,809
Provision for loan losses 50,573 12,027 21,902
Carrying value 24,973 38,873  
Unpaid balance 25,938 44,259  
Commercial real estate | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance - purchased credit-impaired loans 0 0 4
Provision for loan losses 5,493 3,328 (6,196)
Carrying value 5,078 15,197  
Unpaid balance 5,466 17,232  
Consumer real estate | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance - purchased credit-impaired loans 1,086 1,087 355
Provision for loan losses (16,034) (23,693) (21,168)
Carrying value 23,681 30,723  
Unpaid balance 26,245 34,820  
Credit card & other | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance - purchased credit-impaired loans 31 127 0
Provision for loan losses 11,904 18,395 $ 7,901
Carrying value 489 1,627  
Unpaid balance $ 567 $ 1,879