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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, 2018	Dec. 31, 2017
Financing Receivable Impaired [Line Items]
Unpaid Contractual Principal Balance	$ 25,099	$ 29,888
Recorded Investment with No Allowance	789	5,211
Recorded Investment with Allowance	23,612	24,002
Total Recorded Investment	24,401	29,213
Related Allowance	8,703	9,105
Average Recorded Investment	24,336	30,756
Commercial And Industrial [Member]
Financing Receivable Impaired [Line Items]
Unpaid Contractual Principal Balance	23,677	28,856
Recorded Investment with No Allowance	242	5,211
Recorded Investment with Allowance	23,435	23,645
Total Recorded Investment	23,677	28,856
Related Allowance	8,678	9,059
Average Recorded Investment	23,807	30,277
Home Equity Lines Of Credit [Member]
Financing Receivable Impaired [Line Items]
Unpaid Contractual Principal Balance	184	184
Recorded Investment with No Allowance	184
Recorded Investment with Allowance		184
Total Recorded Investment	184	184
Related Allowance		20
Average Recorded Investment	184	300
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Unpaid Contractual Principal Balance	544	171
Recorded Investment with No Allowance	352
Recorded Investment with Allowance	167	171
Total Recorded Investment	519	171
Related Allowance	24	24
Average Recorded Investment	275	174
Other [Member]
Financing Receivable Impaired [Line Items]
Unpaid Contractual Principal Balance	694	677
Recorded Investment with No Allowance	11
Recorded Investment with Allowance	10	2
Total Recorded Investment	21	2
Related Allowance	1	2
Average Recorded Investment	$ 70	$ 5

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