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Bank Loans (Loans That Were Individually Evaluated For Impairment By Portfolio Segment) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 29,713 $ 28,742
Recorded Investment with Allowance 28,036 26,934
Total Recorded Investment 28,036 26,934
Related Allowance 3,602 3,375
Average Recorded Investment 27,916 32,242
Commercial And Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 18,010 16,815
Recorded Investment with Allowance 18,010 16,815
Total Recorded Investment 18,010 16,815
Related Allowance 2,453 2,392
Average Recorded Investment 17,885 22,559
Consumer [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 701 833
Recorded Investment with Allowance 5 6
Total Recorded Investment 5 6
Related Allowance 5 6
Average Recorded Investment 9 9
Residential Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 176 178
Recorded Investment with Allowance 176 178
Total Recorded Investment 176 178
Related Allowance 24 24
Average Recorded Investment 177 181
Commercial Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 10,503 10,503
Recorded Investment with Allowance 9,522 9,522
Total Recorded Investment 9,522 9,522
Related Allowance 972 722
Average Recorded Investment 9,522 9,080
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 148 231
Average Recorded Investment $ 323 $ 413