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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Troubled Debt Restructurings) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
loans
Sep. 30, 2017
loans
Dec. 31, 2017
USD ($)
Troubled debt restructurings      
Number of loans | loans 0 5  
Pre-Modification Recorded Investment     $ 4,391
Post-Modification Recorded Investment     4,417
Commercial and industrial      
Troubled debt restructurings      
Number of loans | loans   4  
Pre-Modification Recorded Investment     4,374
Post-Modification Recorded Investment     4,400
Other      
Troubled debt restructurings      
Number of loans | loans   1  
Pre-Modification Recorded Investment     17
Post-Modification Recorded Investment     $ 17