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Bank Loans (Loans That Were Individually Evaluated For Impairment By Portfolio Segment) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 29,985 $ 2,062
Recorded Investment with No Allowance 9,853 543
Recorded Investment with Allowance 18,448 520
Total Recorded Investment 28,301 1,063
Related Allowance 2,595 188
Average Recorded Investment 34,148 1,117
Commercial And Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 17,938  
Recorded Investment with Allowance 17,938  
Total Recorded Investment 17,938  
Related Allowance 2,415  
Average Recorded Investment 24,338  
Consumer [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 802 944
Recorded Investment with No Allowance 2  
Recorded Investment with Allowance 7 15
Total Recorded Investment 9 15
Related Allowance 7 15
Average Recorded Investment 10 23
Residential Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 419 776
Recorded Investment with No Allowance 329 524
Recorded Investment with Allowance 180 182
Total Recorded Investment 509 706
Related Allowance 24 24
Average Recorded Investment 562 752
Commercial Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 10,503  
Recorded Investment with No Allowance 9,522  
Total Recorded Investment 9,522  
Average Recorded Investment 8,915  
Home Equity Lines Of Credit [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 323 342
Recorded Investment with No Allowance   19
Recorded Investment with Allowance 323 323
Total Recorded Investment 323 342
Related Allowance 149 149
Average Recorded Investment $ 323 $ 342