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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	Sep. 30, 2019	Dec. 31, 2018
Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	$ 1,386,597	$ 1,362,489
Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	35,897	42,394
Performing | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,377,229	1,352,701
Performing | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	34,067	39,876
Nonperforming | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	9,368	9,788
Nonperforming | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,830	2,518
Residential real estate | Home equity | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	205,050	208,459
Residential real estate | Home equity | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	16,488	21,149
Residential real estate | Mortgages | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,107,147	1,083,802
Residential real estate | Mortgages | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	18,635	20,484
Residential real estate | Performing | Home equity | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	203,191	206,675
Residential real estate | Performing | Home equity | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	15,565	19,735
Residential real estate | Performing | Mortgages | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,099,887	1,076,032
Residential real estate | Performing | Mortgages | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	17,728	19,380
Residential real estate | Nonperforming | Home equity | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,859	1,784
Residential real estate | Nonperforming | Home equity | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	923	1,414
Residential real estate | Nonperforming | Mortgages | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	7,260	7,770
Residential real estate | Nonperforming | Mortgages | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	907	1,104
Consumer and other | Indirect | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	13,611	12,663
Consumer and other | Indirect | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Consumer and other | Consumer Other | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	60,789	57,565
Consumer and other | Consumer Other | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	774	761
Consumer and other | Performing | Indirect | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	13,466	12,508
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 | Consumer Other | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	60,685	57,486
Consumer and other | Performing | Consumer Other | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	774	761
Consumer and other | Nonperforming | Indirect | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	145	155
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 | Consumer Other | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	104	79
Consumer and other | Nonperforming | Consumer 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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