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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, 2019 | Dec. 31, 2018
Financing Receivable Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | $ 24,860 | $ 25,099
Recorded Investment with No Allowance | 856 | 789
Recorded Investment with Allowance | 23,797 | 23,612
Total Recorded Investment | 24,653 | 24,401
Related Allowance | 8,725 | 8,703
Average Recorded Investment | 24,868 | 24,336
Commercial And Industrial [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 23,654 | 23,677
Recorded Investment with No Allowance | 220 | 242
Recorded Investment with Allowance | 23,434 | 23,435
Total Recorded Investment | 23,654 | 23,677
Related Allowance | 8,677 | 8,678
Average Recorded Investment | 23,821 | 23,807
Residential Real Estate [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 677 | 544
Recorded Investment with No Allowance | 452 | 352
Recorded Investment with Allowance | 167 | 167
Total Recorded Investment | 619 | 519
Related Allowance | 24 | 24
Average Recorded Investment | 630 | 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 | 345 | 694
Recorded Investment with No Allowance |  | 11
Recorded Investment with Allowance | 196 | 10
Total Recorded Investment | 196 | 21
Related Allowance | 24 | 1
Average Recorded Investment | $ 233 | $ 70

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