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Bank Loans (Loans That Were Individually Evaluated For Impairment By Portfolio Segment) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 16,423 $ 25,099
Recorded Investment with No Allowance 1,820 789
Recorded Investment with Allowance 14,383 23,612
Total Recorded Investment 16,203 24,401
Related Allowance 8,200 8,703
Average Recorded Investment 24,007 24,336
Commercial And Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 14,169 23,677
Recorded Investment with No Allowance 104 242
Recorded Investment with Allowance 14,065 23,435
Total Recorded Investment 14,169 23,677
Related Allowance 8,158 8,678
Average Recorded Investment 22,102 23,807
Residential Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 1,767 544
Recorded Investment with No Allowance 1,532 352
Recorded Investment with Allowance 165 167
Total Recorded Investment 1,697 519
Related Allowance 24 24
Average Recorded Investment 1,536 275
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 303 694
Recorded Investment with No Allowance   11
Recorded Investment with Allowance 153 10
Total Recorded Investment 153 21
Related Allowance 18 1
Average Recorded Investment $ 185 $ 70