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Allowance for Loan and Lease Losses - Credit Quality Indicators by Residential Real Estate and Consumer (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	$ 1,292,335	$ 1,215,883
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	55,346	63,986
Performing | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,283,272	1,208,259
Performing | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	53,138	62,383
Nonperforming | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	9,063	7,624
Nonperforming | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	2,208	1,603
Residential real estate | Home equity | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	213,570	209,277
Residential real estate | Home equity | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	31,305	37,737
Residential real estate | Mortgages | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,017,205	947,378
Residential real estate | Mortgages | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	23,167	25,423
Residential real estate | Performing | Home equity | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	212,116	207,261
Residential real estate | Performing | Home equity | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	30,296	37,074
Residential real estate | Performing | Mortgages | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,009,982	941,936
Residential real estate | Performing | Mortgages | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	21,968	24,483
Residential real estate | Nonperforming | Home equity | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,454	2,016
Residential real estate | Nonperforming | Home equity | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,009	663
Residential real estate | Nonperforming | Mortgages | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	7,223	5,442
Residential real estate | Nonperforming | Mortgages | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,199	940
Consumer and other | Indirect | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	12,632	14,835
Consumer and other | Indirect | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Consumer and other | Other financing receivable | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	48,928	44,393
Consumer and other | Other financing receivable | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	874	826
Consumer and other | Performing | Indirect | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	12,276	14,669
Consumer and other | Performing | Indirect | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Consumer and other | Performing | Other financing receivable | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	48,898	44,393
Consumer and other | Performing | Other financing receivable | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	874	826
Consumer and other | Nonperforming | Indirect | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	356	166
Consumer and other | Nonperforming | Indirect | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Consumer and other | Nonperforming | Other financing receivable | Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	30	0
Consumer and other | Nonperforming | Other financing receivable | Acquired
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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