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Loans and Allowance for Loan and Lease Losses (Troubled Debt Restructurings) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Loan
contract
Dec. 31, 2016
USD ($)
Loan
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 10,536,000 $ 5,368,000
Financing Receivable, Modifications, Post-Modification Recorded Investment 10,730,000 4,823,000
Financing Receivable, Modifications, Recorded Investment $ 9,571,000 $ 3,515,000
Financing Receivable, Modifications, Number of Contracts | Loan 0 0
Entity Loan Modification Program    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 7,322,000  
Financing Receivable, Modifications, Post-Modification Recorded Investment 7,610,000  
Financing Receivable, Modifications, Recorded Investment $ 7,574,000  
Financing Receivable, Modifications, Number of Contracts | contract 10  
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Entity Loan Modification Program    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 4,110,000  
Financing Receivable, Modifications, Post-Modification Recorded Investment 4,460,000  
Financing Receivable, Modifications, Recorded Investment $ 4,434,000  
Financing Receivable, Modifications, Number of Contracts | contract 1  
Commercial Portfolio [Member] | Commercial and Industrial [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 4,110,000 $ 40,000
Financing Receivable, Modifications, Post-Modification Recorded Investment 4,460,000 35,000
Financing Receivable, Modifications, Recorded Investment 4,434,000 5,000
Commercial Portfolio [Member] | Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Pre-Modification Recorded Investment 5,735,000 4,569,000
Financing Receivable, Modifications, Post-Modification Recorded Investment 5,581,000 4,031,000
Financing Receivable, Modifications, Recorded Investment 4,593,000 2,871,000
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Entity Loan Modification Program    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Pre-Modification Recorded Investment 3,212,000  
Financing Receivable, Modifications, Post-Modification Recorded Investment 3,150,000  
Financing Receivable, Modifications, Recorded Investment $ 3,140,000  
Financing Receivable, Modifications, Number of Contracts | contract 9  
Residential Portfolio [Member] | Residential Mortgage [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 691,000 759,000
Financing Receivable, Modifications, Post-Modification Recorded Investment 689,000 757,000
Financing Receivable, Modifications, Recorded Investment $ 544,000 $ 639,000