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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, 2017
Dec. 31, 2016
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 15,125 $ 28,742
Recorded Investment with Allowance 14,450 26,934
Total Recorded Investment 14,450 26,934
Related Allowance 2,332 3,375
Average Recorded Investment 17,427 32,242
Commercial And Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 13,949 16,815
Recorded Investment with Allowance 13,949 16,815
Total Recorded Investment 13,949 16,815
Related Allowance 2,155 2,392
Average Recorded Investment 16,921 22,559
Consumer [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 679 833
Recorded Investment with Allowance 4 6
Total Recorded Investment 4 6
Related Allowance 4 6
Average Recorded Investment 7 9
Residential Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 174 178
Recorded Investment with Allowance 174 178
Total Recorded Investment 174 178
Related Allowance 24 24
Average Recorded Investment 176 181
Home Equity Lines Of Credit [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 323 413
Recorded Investment with Allowance 323 413
Total Recorded Investment 323 413
Related Allowance 149 231
Average Recorded Investment $ 323 413
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