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Allowance for Loan and Lease Losses - Credit Quality Indicators by Class of Residential Real Estate (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Originated Loans and Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross $ 1,418,091 $ 1,362,489
Originated Loans and Leases | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 1,408,557 1,352,701
Originated Loans and Leases | Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 9,534 9,788
Originated Loans and Leases | Residential real estate | Residential Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 203,894 208,459
Originated Loans and Leases | Residential real estate | Residential Mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 1,140,572 1,083,802
Originated Loans and Leases | Residential real estate | Performing | Residential Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 201,970 206,675
Originated Loans and Leases | Residential real estate | Performing | Residential Mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 1,133,237 1,076,032
Originated Loans and Leases | Residential real estate | Nonperforming | Residential Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 1,924 1,784
Originated Loans and Leases | Residential real estate | Nonperforming | Residential Mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 7,335 7,770
Originated Loans and Leases | Consumer and other | Consumer Indirect    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 12,964 12,663
Originated Loans and Leases | Consumer and other | Consumer Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 60,661 57,565
Originated Loans and Leases | Consumer and other | Performing | Consumer Indirect    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 12,847 12,508
Originated Loans and Leases | Consumer and other | Performing | Consumer Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 60,503 57,486
Originated Loans and Leases | Consumer and other | Nonperforming | Consumer Indirect    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 117 155
Originated Loans and Leases | Consumer and other | Nonperforming | Consumer Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 158 79
Acquired Loans and Leases    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 34,156 42,394
Acquired Loans and Leases | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 32,533 39,876
Acquired Loans and Leases | Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 1,623 2,518
Acquired Loans and Leases | Residential real estate | Residential Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 15,351 21,149
Acquired Loans and Leases | Residential real estate | Residential Mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 18,020 20,484
Acquired Loans and Leases | Residential real estate | Performing | Residential Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 14,479 19,735
Acquired Loans and Leases | Residential real estate | Performing | Residential Mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 17,269 19,380
Acquired Loans and Leases | Residential real estate | Nonperforming | Residential Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 872 1,414
Acquired Loans and Leases | Residential real estate | Nonperforming | Residential Mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 751 1,104
Acquired Loans and Leases | Consumer and other | Consumer Indirect    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 0 0
Acquired Loans and Leases | Consumer and other | Consumer Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 785 761
Acquired Loans and Leases | Consumer and other | Performing | Consumer Indirect    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 0 0
Acquired Loans and Leases | Consumer and other | Performing | Consumer Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 785 761
Acquired Loans and Leases | Consumer and other | Nonperforming | Consumer Indirect    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross 0 0
Acquired Loans and Leases | Consumer and other | Nonperforming | Consumer Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, gross $ 0 $ 0