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Allowance for Loan and Lease Losses - Recorded Investment and Related Allowance (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Originated Loans and Leases    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 13,530 $ 11,837
Unpaid Principal Balance With No Related Allowance 13,905 11,925
Recorded Investment With Related Allowance 1,377 513
Unpaid Principal Balance With Related Allowance 1,377 532
Related Allowance 471 441
Carrying amount 14,907 12,350
Outstanding principal balance 15,282 12,457
Total Acquired Loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 3,662 3,421
Unpaid Principal Balance With No Related Allowance 3,795 3,554
Recorded Investment With Related Allowance 25 50
Unpaid Principal Balance With Related Allowance 25 50
Related Allowance 25 25
Carrying amount 3,687 3,471
Outstanding principal balance 3,820 3,604
Commercial and industrial | Originated Loans and Leases | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 3,078 1,246
Unpaid Principal Balance With No Related Allowance 3,078 1,250
Recorded Investment With Related Allowance 1,352 513
Unpaid Principal Balance With Related Allowance 1,352 532
Related Allowance 446 441
Commercial and industrial | Total Acquired Loans | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 281 226
Unpaid Principal Balance With No Related Allowance 373 226
Recorded Investment With Related Allowance 25 50
Unpaid Principal Balance With Related Allowance 25 50
Related Allowance 25 25
Commercial real estate | Originated Loans and Leases | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 6,456 6,626
Unpaid Principal Balance With No Related Allowance 6,656 6,626
Recorded Investment With Related Allowance 25 0
Unpaid Principal Balance With Related Allowance 25 0
Related Allowance 25 0
Commercial real estate | Total Acquired Loans | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,588 1,372
Unpaid Principal Balance With No Related Allowance 1,598 1,474
Residential real estate | Originated Loans and Leases | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 3,996 3,965
Unpaid Principal Balance With No Related Allowance 4,171 4,049
Residential real estate | Total Acquired Loans | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,793 1,823
Unpaid Principal Balance With No Related Allowance $ 1,824 $ 1,854