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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, 2016
Dec. 31, 2015
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 28,742 $ 2,062
Recorded Investment with No Allowance   543
Recorded Investment with Allowance 26,934 520
Total Recorded Investment 26,934 1,063
Related Allowance 3,375 188
Average Recorded Investment 32,242 1,117
Commercial And Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 16,815  
Recorded Investment with Allowance 16,815  
Total Recorded Investment 16,815  
Related Allowance 2,392  
Average Recorded Investment 22,559  
Consumer [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 833 944
Recorded Investment with Allowance 6 15
Total Recorded Investment 6 15
Related Allowance 6 15
Average Recorded Investment 9 23
Residential Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 178 776
Recorded Investment with No Allowance   524
Recorded Investment with Allowance 178 182
Total Recorded Investment 178 706
Related Allowance 24 24
Average Recorded Investment 181 752
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  
Home Equity Lines Of Credit [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 413 342
Recorded Investment with No Allowance   19
Recorded Investment with Allowance 413 323
Total Recorded Investment 413 342
Related Allowance 231 149
Average Recorded Investment $ 413 $ 342