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Fair Value Measurements (Narrative) (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2014
USD ($)
loan
Cash and cash equivalents $ 777,600 $ 908,900  
Impaired loans 6,200    
Specific reserves and other write downs on impaired loans 2,100    
Troubled debt restructured loans balance 2,363 $ 2,241  
Troubled debt restructured loans, specific reserve $ 771    
Number of troubled debt restructured loans | loan 10 8  
Minimum [Member]      
Estimated selling costs 7.00%    
Maximum [Member]      
Estimated selling costs 10.00%    
Walnut Street [Member]      
Loans, face value     $ 267,600
Price paid for a portion of the commercial loan portfolio     209,600
Notes payable     $ 193,600
Number of notes | loan     2
Fair Value, Measurements, Nonrecurring [Member]      
Impaired loans $ 4,063 $ 3,559  
Senior Notes [Member] | Walnut Street [Member]      
Senior notes     $ 178,200
Debt Instrument, Interest Rate, Stated Percentage     1.50%
Junior Subordinated Debt [Member] | Walnut Street [Member]      
Junior Subordinated Notes     $ 15,400
Debt Instrument, Interest Rate, Stated Percentage     10.00%