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Allowance for Loan and Lease Losses - Credit Quality Indicators by Class of Residential Real Estate and Consumer Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | $ 1,324,983 | $ 1,314,210
Originated Loans and Leases | Performing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 1,316,414 | 1,306,211
Originated Loans and Leases | Nonperforming |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 8,569 | 7,999
Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 49,193 | 51,854
Total Acquired Loans | Performing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 45,867 | 49,136
Total Acquired Loans | Nonperforming |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 3,326 | 2,718
Residential real estate | Originated Loans and Leases | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 211,444 | 212,812
Residential real estate | Originated Loans and Leases | Mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 1,051,711 | 1,039,040
Residential real estate | Originated Loans and Leases | Performing | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 209,940 | 211,275
Residential real estate | Originated Loans and Leases | Performing | Mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 1,044,886 | 1,032,932
Residential real estate | Originated Loans and Leases | Nonperforming | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 1,504 | 1,537
Residential real estate | Originated Loans and Leases | Nonperforming | Mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 6,825 | 6,108
Residential real estate | Total Acquired Loans | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 26,084 | 28,444
Residential real estate | Total Acquired Loans | Mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 22,204 | 22,645
Residential real estate | Total Acquired Loans | Performing | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 24,329 | 26,840
Residential real estate | Total Acquired Loans | Performing | Mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 20,633 | 21,531
Residential real estate | Total Acquired Loans | Nonperforming | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 1,755 | 1,604
Residential real estate | Total Acquired Loans | Nonperforming | Mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 1,571 | 1,114
Consumer and other | Originated Loans and Leases | Indirect |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 11,921 | 12,144
Consumer and other | Originated Loans and Leases | Commercial and industrial other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 49,907 | 50,214
Consumer and other | Originated Loans and Leases | Performing | Indirect |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 11,757 | 11,866
Consumer and other | Originated Loans and Leases | Performing | Commercial and industrial other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 49,831 | 50,138
Consumer and other | Originated Loans and Leases | Nonperforming | Indirect |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 164 | 278
Consumer and other | Originated Loans and Leases | Nonperforming | Commercial and industrial other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 76 | 76
Consumer and other | Total Acquired Loans | Indirect |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
Consumer and other | Total Acquired Loans | Commercial and industrial other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross |  | 765
Consumer and other | Total Acquired Loans | Performing | Indirect |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
Consumer and other | Total Acquired Loans | Performing | Commercial and industrial other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 905 | 765
Consumer and other | Total Acquired Loans | Nonperforming | Indirect |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
Consumer and other | Total Acquired Loans | Nonperforming | Commercial and industrial other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | $ 0 | $ 0

X
- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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