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Allowance for Loan and Lease Losses - Recorded Investment and Related Allowance (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Originated Loans and Leases    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 13,752 $ 11,837
Unpaid Principal Balance With No Related Allowance 14,136 11,832
Recorded Investment With Related Allowance 1,312 513
Unpaid Principal Balance With Related Allowance 1,323 532
Related Allowance 441 441
Recorded Investment 15,064 12,350
Unpaid Principal Balance 15,459 12,364
Total Acquired Loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 3,323 3,421
Unpaid Principal Balance With No Related Allowance 3,446 3,554
Recorded Investment With Related Allowance 25 50
Unpaid Principal Balance With Related Allowance 25 50
Related Allowance 25 25
Recorded Investment 3,348 3,471
Unpaid Principal Balance 3,471 3,604
Commercial and industrial | Originated Loans and Leases | Other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 2,958 1,246
Unpaid Principal Balance With No Related Allowance 2,958 1,250
Recorded Investment With Related Allowance 1,266 513
Unpaid Principal Balance With Related Allowance 1,266 532
Related Allowance 412 441
Commercial and industrial | Total Acquired Loans | Other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 287 226
Unpaid Principal Balance With No Related Allowance 379 226
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 6,757 6,626
Unpaid Principal Balance With No Related Allowance 6,965 6,533
Recorded Investment With Related Allowance 46 0
Unpaid Principal Balance With Related Allowance 57 0
Related Allowance 29 0
Commercial real estate | Total Acquired Loans | Other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,257 1,372
Unpaid Principal Balance With No Related Allowance 1,258 1,474
Recorded Investment With Related Allowance 25 0
Unpaid Principal Balance With Related Allowance 25 0
Related Allowance 25 0
Residential real estate | Originated Loans and Leases | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 4,037 3,965
Unpaid Principal Balance With No Related Allowance 4,213 4,049
Residential real estate | Total Acquired Loans | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,779 1,823
Unpaid Principal Balance With No Related Allowance $ 1,809 $ 1,854