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Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule of Financing Receivables [Line Items]
Loans	$ 1,224,440	$ 1,164,139	$ 1,120,665
Percentage of loans receivable, by type	100.00%	100.00%	100.00%
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
Loans	$ 350,114	$ 323,809	$ 306,490
Percentage of loans receivable, by type	28.60%	27.80%	27.40%
Commercial | Construction
Schedule of Financing Receivables [Line Items]
Loans	$ 40,308	$ 38,056	$ 33,605
Percentage of loans receivable, by type	3.30%	3.30%	3.00%
Commercial | Other
Schedule of Financing Receivables [Line Items]
Loans	$ 184,718	$ 181,528	$ 173,691
Percentage of loans receivable, by type	15.10%	15.60%	15.50%
Municipal
Schedule of Financing Receivables [Line Items]
Loans	$ 48,717	$ 33,391	$ 28,695
Percentage of loans receivable, by type	4.00%	2.90%	2.60%
Residential | Construction
Schedule of Financing Receivables [Line Items]
Loans	$ 14,583	$ 17,868	$ 15,056
Percentage of loans receivable, by type	1.20%	1.50%	1.30%
Residential | Term
Schedule of Financing Receivables [Line Items]
Loans	$ 453,588	$ 432,661	$ 427,171
Percentage of loans receivable, by type	37.00%	37.10%	38.10%
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Loans	$ 107,666	$ 111,302	$ 110,328
Percentage of loans receivable, by type	8.80%	9.60%	9.80%
Consumer
Schedule of Financing Receivables [Line Items]
Loans	$ 24,746	$ 25,524	$ 25,629
Percentage of loans receivable, by type	2.00%	2.20%	2.30%

X

- Definition

Reflects the break down of the gross carrying amount of all categories of loans and leases held in the portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases as a percentage of total portfolio.

+ References

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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