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Allowance for Loan and Lease Losses - Recorded Investment and Related Allowance (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Originated Loans and Leases    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 9,727 $ 7,303
Unpaid Principal Balance With No Related Allowance 13,711 7,844
Recorded Investment With Related Allowance 1,254 6,864
Unpaid Principal Balance With Related Allowance 1,273 6,864
Related Allowance 435 3,762
Recorded Investment 10,981 14,167
Unpaid Principal Balance 14,984 14,708
Total Acquired Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 0 0
Recorded Investment 3,521 3,438
Unpaid Principal Balance 3,706 3,652
Commercial and industrial | Originated Loans and Leases | Other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,116 183
Unpaid Principal Balance With No Related Allowance 1,343 271
Recorded Investment With Related Allowance 809 5,183
Unpaid Principal Balance With Related Allowance 828 5,183
Related Allowance 384 3,365
Commercial and industrial | Total Acquired Loans | Other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 12 32
Unpaid Principal Balance With No Related Allowance 12 32
Commercial real estate | Originated Loans and Leases | Other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 4,564 3,205
Unpaid Principal Balance With No Related Allowance 8,107 3,405
Recorded Investment With Related Allowance 445 1,681
Unpaid Principal Balance With Related Allowance 445 1,681
Related Allowance 51 397
Commercial real estate | Total Acquired Loans | Other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 840 842
Unpaid Principal Balance With No Related Allowance 922 924
Residential real estate | Originated Loans and Leases | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 4,047 3,915
Unpaid Principal Balance With No Related Allowance 4,261 4,168
Residential real estate | Total Acquired Loans | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 2,669 2,564
Unpaid Principal Balance With No Related Allowance $ 2,772 $ 2,696