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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.

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