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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, 2019
Dec. 31, 2018
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 24,860 $ 25,099
Recorded Investment with No Allowance 856 789
Recorded Investment with Allowance 23,797 23,612
Total Recorded Investment 24,653 24,401
Related Allowance 8,725 8,703
Average Recorded Investment 24,868 24,336
Commercial And Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 23,654 23,677
Recorded Investment with No Allowance 220 242
Recorded Investment with Allowance 23,434 23,435
Total Recorded Investment 23,654 23,677
Related Allowance 8,677 8,678
Average Recorded Investment 23,821 23,807
Residential Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 677 544
Recorded Investment with No Allowance 452 352
Recorded Investment with Allowance 167 167
Total Recorded Investment 619 519
Related Allowance 24 24
Average Recorded Investment 630 275
Home Equity Lines Of Credit [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 184 184
Recorded Investment with No Allowance 184 184
Total Recorded Investment 184 184
Average Recorded Investment 184 184
Other [Member]    
Financing Receivable Impaired [Line Items]    
Unpaid Contractual Principal Balance 345 694
Recorded Investment with No Allowance   11
Recorded Investment with Allowance 196 10
Total Recorded Investment 196 21
Related Allowance 24 1
Average Recorded Investment $ 233 $ 70