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Allowance for Loan and Lease Losses - Recorded Investment on Impaired Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Originated Loans and Leases    
Financing Receivable, Impaired [Line Items]    
Recorded investment with no related allowance $ 11,837 $ 10,762
Unpaid principal balance with no related allowance 11,832 11,168
Recorded investment with related allowance 513 2,192
Unpaid principal balance with related allowance 532 2,318
Related Allowance 441 417
Recorded investment 12,350 12,954
Unpaid principal balance 12,364 13,486
Originated Loans and Leases | Commercial and industrial | Other    
Financing Receivable, Impaired [Line Items]    
Recorded investment with no related allowance 1,246 276
Unpaid principal balance with no related allowance 1,250 370
Recorded investment with related allowance 513 359
Unpaid principal balance with related allowance 532 276
Related Allowance 441 95
Originated Loans and Leases | Commercial real estate | Other    
Financing Receivable, Impaired [Line Items]    
Recorded investment with no related allowance 6,626 6,979
Unpaid principal balance with no related allowance 6,533 7,263
Recorded investment with related allowance 0 1,833
Unpaid principal balance with related allowance 0 2,042
Related Allowance 0 322
Originated Loans and Leases | Residential real estate | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded investment with no related allowance 3,965 3,507
Unpaid principal balance with no related allowance 4,049 3,535
Acquired Loans and Leases    
Financing Receivable, Impaired [Line Items]    
Recorded investment with no related allowance 3,421 5,547
Unpaid principal balance with no related allowance 3,554 6,230
Recorded investment with related allowance 50 78
Unpaid principal balance with related allowance 50 78
Related Allowance 25 76
Recorded investment 3,471 5,625
Unpaid principal balance 3,604 6,308
Acquired Loans and Leases | Commercial and industrial | Other    
Financing Receivable, Impaired [Line Items]    
Recorded investment with no related allowance 226 172
Unpaid principal balance with no related allowance 226 472
Recorded investment with related allowance 50 0
Unpaid principal balance with related allowance 50 0
Related Allowance 25 0
Acquired Loans and Leases | Commercial real estate | Other    
Financing Receivable, Impaired [Line Items]    
Recorded investment with no related allowance 1,372 4,003
Unpaid principal balance with no related allowance 1,474 4,386
Recorded investment with related allowance 0 78
Unpaid principal balance with related allowance 0 78
Related Allowance 0 76
Acquired Loans and Leases | Residential real estate | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded investment with no related allowance 1,823 1,372
Unpaid principal balance with no related allowance $ 1,854 $ 1,372