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Allowance for Loan and Lease Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Originated Loans and Leases    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 10,196 $ 10,762
Unpaid Principal Balance With No Related Allowance 10,726 11,168
Recorded Investment With Related Allowance 1,021 2,192
Unpaid Principal Balance With Related Allowance 1,040 2,318
Related Allowance 539 417
Recorded Investment 11,217 12,954
Unpaid Principal Balance 11,766 13,486
Total Acquired Loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 3,207 5,547
Unpaid Principal Balance With No Related Allowance 3,432 6,230
Recorded Investment With Related Allowance 267 78
Unpaid Principal Balance With Related Allowance 267 78
Related Allowance 75 76
Recorded Investment 3,474 5,625
Unpaid Principal Balance 3,699 6,308
Commercial and industrial | Originated Loans and Leases | Other financing receivable    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 653 276
Unpaid Principal Balance With No Related Allowance 657 370
Recorded Investment With Related Allowance 772 359
Unpaid Principal Balance With Related Allowance 791 276
Related Allowance 518 95
Commercial and industrial | Total Acquired Loans | Other financing receivable    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 0 172
Unpaid Principal Balance With No Related Allowance 0 472
Commercial real estate | Originated Loans and Leases | Other financing receivable    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 6,296 6,979
Unpaid Principal Balance With No Related Allowance 6,737 7,263
Recorded Investment With Related Allowance 100 1,833
Unpaid Principal Balance With Related Allowance 100 2,042
Related Allowance 19 322
Commercial real estate | Total Acquired Loans | Other financing receivable    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,842 4,003
Unpaid Principal Balance With No Related Allowance 2,035 4,386
Recorded Investment With Related Allowance 267 78
Unpaid Principal Balance With Related Allowance 267 78
Related Allowance 75 76
Residential real estate | Originated Loans and Leases | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 3,247 3,507
Unpaid Principal Balance With No Related Allowance 3,332 3,535
Recorded Investment With Related Allowance 149 0
Unpaid Principal Balance With Related Allowance 149 0
Related Allowance 2 0
Residential real estate | Total Acquired Loans | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,365 1,372
Unpaid Principal Balance With No Related Allowance $ 1,397 $ 1,372