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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, 2019
Dec. 31, 2018
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 14,737 $ 25,099
Recorded Investment with No Allowance 1,647 789
Recorded Investment with Allowance 12,940 23,612
Total Recorded Investment 14,587 24,401
Related Allowance 8,182 8,703
Average Recorded Investment 15,587 24,336
Commercial And Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 12,991 23,677
Recorded Investment with No Allowance 51 242
Recorded Investment with Allowance 12,940 23,435
Total Recorded Investment 12,991 23,677
Related Allowance 8,158 8,678
Average Recorded Investment 14,172 23,807
Residential Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 1,412 544
Recorded Investment with No Allowance 1,412 352
Recorded Investment with Allowance   167
Total Recorded Investment 1,412 519
Related Allowance 24 24
Average Recorded Investment 1,231 275
Home Equity Lines Of Credit [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 184 184
Recorded Investment with No Allowance 184 184
Total Recorded Investment 184 184
Average Recorded Investment 184 184
Other [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 150 694
Recorded Investment with No Allowance   11
Recorded Investment with Allowance   10
Total Recorded Investment   21
Related Allowance   1
Average Recorded Investment   $ 70