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Allowance for Loan and Lease Losses - Average Recorded Investment and Interest Income Recognized (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment $ 17,900 $ 15,800 $ 17,000
Originated Loans and Leases      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment With No Related Allowance 11,127 11,556 9,341
Interest Income Recognized With No Related Allowance 0 0 0
Average Recorded Investment With Related Allowance 2,731 276 1,829
Interest Income Recognized With Related Allowance 0 0 0
Average Recorded Investment 13,858 11,832 11,170
Interest Income Recognized 0 0 0
Originated Loans and Leases | Commercial and industrial | Other      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment With No Related Allowance 1,979 718 249
Interest Income Recognized With No Related Allowance 0 0 0
Average Recorded Investment With Related Allowance 1,374 276 114
Interest Income Recognized With Related Allowance 0 0 0
Originated Loans and Leases | Commercial real estate | Other      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment With No Related Allowance 5,165 7,287 6,089
Interest Income Recognized With No Related Allowance 0 0 0
Average Recorded Investment With Related Allowance 1,357 0 1,715
Interest Income Recognized With Related Allowance 0 0 0
Originated Loans and Leases | Residential real estate | Home equity      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment With No Related Allowance 3,983 3,551 3,003
Interest Income Recognized With No Related Allowance 0 0 0
Acquired Loans and Leases      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment With No Related Allowance 3,994 4,113 5,792
Interest Income Recognized With No Related Allowance 0 0 0
Average Recorded Investment With Related Allowance 0 10 58
Interest Income Recognized With Related Allowance 0 0 0
Average Recorded Investment 3,994 4,123 5,850
Interest Income Recognized 0 0 0
Acquired Loans and Leases | Commercial and industrial | Other      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment With No Related Allowance 50 111 183
Interest Income Recognized With No Related Allowance 0 0 0
Average Recorded Investment With Related Allowance 0 10 0
Interest Income Recognized With Related Allowance 0 0 0
Acquired Loans and Leases | Commercial real estate | Other      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment With No Related Allowance 999 2,141 4,141
Interest Income Recognized With No Related Allowance 0 0 0
Average Recorded Investment With Related Allowance 0 0 58
Interest Income Recognized With Related Allowance 0 0 0
Acquired Loans and Leases | Commercial real estate | Construction      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment With No Related Allowance 0 0 152
Interest Income Recognized With No Related Allowance 0 0 0
Acquired Loans and Leases | Residential real estate | Home equity      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment With No Related Allowance 2,945 1,861 1,316
Interest Income Recognized With No Related Allowance $ 0 $ 0 $ 0