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Bank Loans (Loans That Were Individually Evaluated For Impairment By Portfolio Segment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 13,952 $ 14,737
Recorded Investment with No Allowance 1,407 1,647
Recorded Investment with Allowance 12,395 12,940
Total Recorded Investment 13,802 14,587
Related Allowance 8,182 8,182
Average Recorded Investment 14,509 15,587
Commercial And Industrial    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 12,251 12,991
Recorded Investment with No Allowance 14 51
Recorded Investment with Allowance 12,237 12,940
Total Recorded Investment 12,251 12,991
Related Allowance 8,158 8,158
Average Recorded Investment 12,954 14,172
Residential Mortgage    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 1,407 1,412
Recorded Investment with No Allowance 1,249 1,412
Recorded Investment with Allowance 158  
Total Recorded Investment 1,407 1,412
Related Allowance 24 24
Average Recorded Investment 1,410 1,231
Commercial Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 144  
Recorded Investment with No Allowance 144  
Total Recorded Investment 144  
Average Recorded Investment 145  
Other [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 150 150
Home Equity Lines Of Credit [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance   184
Recorded Investment with No Allowance   184
Total Recorded Investment   184
Average Recorded Investment   $ 184