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Loans and Allowance for Credit Losses on Loans (Composition of Loan Portfolio, Excluding Residential Loans Held for Sale) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 3,219,822    
Loans 3,219,822 $ 3,095,023 $ 3,026,222
Residential real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,054,798 1,070,374  
Loans 1,054,798 1,070,374 992,866
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,369,470 1,243,397  
Loans   1,243,397 1,269,533
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 381,494 442,701  
Loans 381,494 442,701 415,436
Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 258,573 312,779  
Loans 258,573 312,779 327,763
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 20,392 25,772  
Loans 20,392 25,772 $ 20,624
SBA PPP Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 135,095 0  
Loans 135,095    
Commercial Loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,886,059 1,686,098  
Retail Loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,333,763 $ 1,408,925  
Commercial real estate, non owner-occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,100,000    
Commercial real estate, owner-occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 271,500