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Allowance for Loan and Lease Losses - Recorded Investment and Related Allowance (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Originated Loans and Leases    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 11,648 $ 11,837
Unpaid Principal Balance With No Related Allowance 12,163 11,832
Recorded Investment With Related Allowance 1,425 513
Unpaid Principal Balance With Related Allowance 1,436 532
Related Allowance 376 441
Recorded Investment 13,073 12,350
Unpaid Principal Balance 13,599 12,364
Total Acquired Loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 3,441 3,421
Unpaid Principal Balance With No Related Allowance 3,543 3,554
Recorded Investment With Related Allowance 0 50
Unpaid Principal Balance With Related Allowance 0 50
Related Allowance 0 25
Recorded Investment 3,441 3,471
Unpaid Principal Balance 3,543 3,604
Commercial and industrial | Originated Loans and Leases | Other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 2,503 1,246
Unpaid Principal Balance With No Related Allowance 2,597 1,250
Recorded Investment With Related Allowance 1,425 513
Unpaid Principal Balance With Related Allowance 1,436 532
Related Allowance 376 441
Commercial and industrial | Total Acquired Loans | Other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 261 226
Unpaid Principal Balance With No Related Allowance 353 226
Recorded Investment With Related Allowance 0 50
Unpaid Principal Balance With Related Allowance 0 50
Related Allowance 0 25
Commercial real estate | Originated Loans and Leases | Other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 5,136 6,626
Unpaid Principal Balance With No Related Allowance 5,336 6,533
Commercial real estate | Total Acquired Loans | Other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,400 1,372
Unpaid Principal Balance With No Related Allowance 1,378 1,474
Residential real estate | Originated Loans and Leases | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 4,009 3,965
Unpaid Principal Balance With No Related Allowance 4,230 4,049
Residential real estate | Total Acquired Loans | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,780 1,823
Unpaid Principal Balance With No Related Allowance $ 1,812 $ 1,854