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Bank Loans (Loans That Were Individually Evaluated For Impairment By Portfolio Segment) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 14,501 $ 14,737
Recorded Investment with No Allowance 1,249 1,647
Recorded Investment with Allowance 13,102 12,940
Total Recorded Investment 14,351 14,587
Related Allowance 8,182 8,182
Average Recorded Investment 14,474 15,587
Commercial And Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 12,940 12,991
Recorded Investment with No Allowance   51
Recorded Investment with Allowance 12,940 12,940
Total Recorded Investment 12,940 12,991
Related Allowance 8,158 8,158
Average Recorded Investment 12,940 14,172
Residential Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 1,411 1,412
Recorded Investment with No Allowance 1,249 1,412
Recorded Investment with Allowance 162  
Total Recorded Investment 1,411 1,412
Related Allowance 24 24
Average Recorded Investment 1,411 1,231
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 123 184
Other [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 150 $ 150