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Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 20 33 83 129
Post-Modification Recorded Investment | $ $ 11,807 $ 14,189 $ 32,220 $ 43,577
Real estate - commercial mortgage        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 4 5 9 12
Post-Modification Recorded Investment | $ $ 9,129 $ 8,394 $ 16,020 $ 24,868
Real-estate - home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 6 13 22 40
Post-Modification Recorded Investment | $ $ 123 $ 1,370 $ 870 $ 3,556
Real estate - residential mortgage        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 5 8 42 48
Post-Modification Recorded Investment | $ $ 1,703 $ 1,351 $ 12,431 $ 10,516
Consumer        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 0 3 0 11
Post-Modification Recorded Investment | $ $ 0 $ 53 $ 0 $ 238