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Loans Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Loans Information [Line Items]      
Interest receivable $ 86,466   $ 90,263
Financing Receivable, Nonaccrual, Interest Income 98 327  
Recorded Investment, loans modified in troubled debt restructuring $ 5,999 $ 4,899  
Restructured Loans Subsequently Accruing 3,000    
Ytd Restructured Loans Still On Nonaccrual 3,000    
Loans and Finance Receivables [Member]      
Loans Information [Line Items]      
Interest receivable 64,000   66,000
Possible Liquidity Issues [Member]      
Loans Information [Line Items]      
Financing Receivable, Troubled Debt Restructuring 49,000   $ 68,000
Possible Liquidity Issues [Member] | Commercial And Industrial Financing Receivable [Member]      
Loans Information [Line Items]      
Financing Receivable, Troubled Debt Restructuring 36,000    
Possible Liquidity Issues [Member] | Commercial Real Estate Portfolio [Member]      
Loans Information [Line Items]      
Financing Receivable, Troubled Debt Restructuring $ 13,000