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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	Jun. 30, 2018	Dec. 31, 2017
Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	$ 1,347,864	$ 1,314,210
Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	46,832	51,854
Performing | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,338,789	1,306,211
Performing | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	43,931	49,136
Nonperforming | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	9,075	7,999
Nonperforming | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	2,901	2,718
Residential real estate | Home equity | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	207,820	212,812
Residential real estate | Home equity | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	24,425	28,444
Residential real estate | Mortgages | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,075,865	1,039,040
Residential real estate | Mortgages | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	21,501	22,645
Residential real estate | Performing | Home equity | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	206,520	211,275
Residential real estate | Performing | Home equity | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	23,234	26,840
Residential real estate | Performing | Mortgages | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,068,440	1,032,932
Residential real estate | Performing | Mortgages | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	19,791	21,531
Residential real estate | Nonperforming | Home equity | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,300	1,537
Residential real estate | Nonperforming | Home equity | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,191	1,604
Residential real estate | Nonperforming | Mortgages | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	7,425	6,108
Residential real estate | Nonperforming | Mortgages | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,710	1,114
Consumer and other | Indirect | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	12,051	12,144
Consumer and other | Indirect | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Consumer and other | Other | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	52,128	50,214
Consumer and other | Other | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	906	765
Consumer and other | Performing | Indirect | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	11,840	11,866
Consumer and other | Performing | Indirect | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Consumer and other | Performing | Other | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	51,989	50,138
Consumer and other | Performing | Other | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	906	765
Consumer and other | Nonperforming | Indirect | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	211	278
Consumer and other | Nonperforming | Indirect | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Consumer and other | Nonperforming | Other | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	139	76
Consumer and other | Nonperforming | Other | Total Acquired Loans
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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