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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, 2017
Dec. 31, 2016
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 29,888 $ 28,742
Recorded Investment with No Allowance 5,211  
Recorded Investment with Allowance 24,002 26,934
Total Recorded Investment 29,213 26,934
Related Allowance 9,105 3,375
Average Recorded Investment 30,756 32,242
Commercial And Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 28,856 16,815
Recorded Investment with No Allowance 5,211  
Recorded Investment with Allowance 23,645 16,815
Total Recorded Investment 28,856 16,815
Related Allowance 9,059 2,392
Average Recorded Investment 30,277 22,559
Consumer [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 677 833
Recorded Investment with Allowance 2 6
Total Recorded Investment 2 6
Related Allowance 2 6
Average Recorded Investment 5 9
Residential Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 171 178
Recorded Investment with Allowance 171 178
Total Recorded Investment 171 178
Related Allowance 24 24
Average Recorded Investment 174 181
Home Equity Lines Of Credit [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 184 413
Recorded Investment with Allowance 184 413
Total Recorded Investment 184 413
Related Allowance 20 231
Average Recorded Investment $ 300 413
Commercial Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance   10,503
Recorded Investment with Allowance   9,522
Total Recorded Investment   9,522
Related Allowance   722
Average Recorded Investment   $ 9,080