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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

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