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Loans and Allowance for Credit Losses Loans Modified Under Troubled Debt Restructurings (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Accruing Troubled Debt Restructurings $ 67,049 $ 68,426
Non-accrual TDRs (1) 44,986 35,755
Total TDRs 112,035 104,181
Real estate - commercial mortgage    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Accruing Troubled Debt Restructurings 27,961 28,451
Commercial Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Accruing Troubled Debt Restructurings 7,041 6,982
Residential Mortgage    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Accruing Troubled Debt Restructurings 18,214 18,602
Real-estate - home equity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Accruing Troubled Debt Restructurings 13,674 14,391
Construction    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Accruing Troubled Debt Restructurings 154 0
Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Accruing Troubled Debt Restructurings $ 5 $ 0