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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment $ 18,200 $ 17,900 $ 15,800
Originated Loans and Leases      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment With No Related Allowance 13,325 11,127 11,556
Interest Income Recognized With No Related Allowance 0 0 0
Average Recorded Investment With Related Allowance 1,523 2,731 276
Interest Income Recognized With Related Allowance 0 0 0
Average Recorded Investment 14,848 13,858 11,832
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 1,830 1,979 718
Interest Income Recognized With No Related Allowance 0 0 0
Average Recorded Investment With Related Allowance 132 1,374 276
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 7,552 5,165 7,287
Interest Income Recognized With No Related Allowance 0 0 0
Average Recorded Investment With Related Allowance 1,391 1,357 0
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 3,943 3,983 3,551
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 3,346 3,994 4,113
Interest Income Recognized With No Related Allowance 0 0 0
Average Recorded Investment With Related Allowance 0 0 10
Interest Income Recognized With Related Allowance 0 0 0
Average Recorded Investment 3,346 3,994 4,123
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 21 50 111
Interest Income Recognized With No Related Allowance 0 0 0
Average Recorded Investment With Related Allowance 0 0 10
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 822 999 2,141
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 2,503 2,945 1,861
Interest Income Recognized With No Related Allowance $ 0 $ 0 $ 0