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Bank Loans (Loans That Were Individually Evaluated For Impairment By Portfolio Segment) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 24,747 $ 29,888
Recorded Investment with No Allowance 9 5,211
Recorded Investment with Allowance 24,075 24,002
Total Recorded Investment 24,084 29,213
Related Allowance 9,156 9,105
Average Recorded Investment 24,028 30,756
Commercial And Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 23,719 28,856
Recorded Investment with No Allowance   5,211
Recorded Investment with Allowance 23,720 23,645
Total Recorded Investment 23,720 28,856
Related Allowance 9,111 9,059
Average Recorded Investment 23,663 30,277
Consumer [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 674 677
Recorded Investment with Allowance 1 2
Total Recorded Investment 1 2
Related Allowance 1 2
Average Recorded Investment 2 5
Residential Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 170 171
Recorded Investment with Allowance 170 171
Total Recorded Investment 170 171
Related Allowance 24 24
Average Recorded Investment 170 174
Home Equity Lines Of Credit [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 184 184
Recorded Investment with No Allowance 9  
Recorded Investment with Allowance 184 184
Total Recorded Investment 193 184
Related Allowance 20 20
Average Recorded Investment $ 193 $ 300