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Loans - Schedule of Classes of the Loan Portfolio Summarized by the Aggregate Risk Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 1,272,446	$ 1,244,170	$ 1,236,370
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,214,692	1,183,405
Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	41,304	42,084
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	16,450	18,681
Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	176,073	165,829	169,037
Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	172,689	160,297
Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,217	3,710
Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	167	1,822
Commercial and industrial | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	522,834	492,759	483,673
Commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	484,017	449,854
Commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	26,834	30,400
Commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	11,983	12,505
Commercial real estate | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	18,720	35,560	39,779
Commercial real estate construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	16,743	34,155
Commercial real estate construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,728	1,155
Commercial real estate construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	249	250
Commercial real estate construction | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	433,535	425,893	421,732
Residential mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	420,823	416,154
Residential mortgage | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,202	6,013
Residential mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,510	3,726
Residential mortgage | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	106,679	107,792	105,113
Home equity lines of credit | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	105,815	106,966
Home equity lines of credit | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	323	448
Home equity lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	541	378
Home equity lines of credit | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,605	16,337	$ 17,036
Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,605	15,979
Consumer | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	358
Consumer | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Originated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,063,772	1,003,544
Originated Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,024,673	966,217
Originated Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	29,461	25,510
Originated Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,638	11,817
Originated Loans | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Originated Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	170,618	159,455
Originated Loans | Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	167,353	154,177
Originated Loans | Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,094	3,466
Originated Loans | Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	171	1,812
Originated Loans | Commercial and industrial | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Originated Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	390,621	351,945
Originated Loans | Commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	363,982	325,002
Originated Loans | Commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	18,218	17,666
Originated Loans | Commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	8,421	9,277
Originated Loans | Commercial real estate | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Originated Loans | Commercial real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,774	28,430
Originated Loans | Commercial real estate construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	13,520	27,413
Originated Loans | Commercial real estate construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,005	767
Originated Loans | Commercial real estate construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	249	250
Originated Loans | Commercial real estate construction | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Originated Loans | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	385,859	366,924
Originated Loans | Residential mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	378,301	363,195
Originated Loans | Residential mortgage | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,909	3,251
Originated Loans | Residential mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	649	478
Originated Loans | Residential mortgage | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Originated Loans | Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	87,563	82,336
Originated Loans | Home equity lines of credit | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	87,180	81,976
Originated Loans | Home equity lines of credit | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	235	360
Originated Loans | Home equity lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	148	0
Originated Loans | Home equity lines of credit | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Originated Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,337	14,454
Originated Loans | Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,337	14,454
Originated Loans | Consumer | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Originated Loans | Consumer | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Originated Loans | Consumer | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	208,674	240,626
Acquired Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	190,019	217,188
Acquired Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	11,843	16,574
Acquired Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,812	6,864
Acquired Loans | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Acquired Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,455	6,374
Acquired Loans | Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,336	6,120
Acquired Loans | Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	123	244
Acquired Loans | Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	(4)	10
Acquired Loans | Commercial and industrial | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Acquired Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	132,213	140,814
Acquired Loans | Commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	120,035	124,852
Acquired Loans | Commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	8,616	12,734
Acquired Loans | Commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,562	3,228
Acquired Loans | Commercial real estate | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Acquired Loans | Commercial real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,946	7,130
Acquired Loans | Commercial real estate construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,223	6,742
Acquired Loans | Commercial real estate construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	723	388
Acquired Loans | Commercial real estate construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Acquired Loans | Commercial real estate construction | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Acquired Loans | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	47,676	58,969
Acquired Loans | Residential mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	42,522	52,959
Acquired Loans | Residential mortgage | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,293	2,762
Acquired Loans | Residential mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,861	3,248
Acquired Loans | Residential mortgage | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Acquired Loans | Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	19,116	25,456
Acquired Loans | Home equity lines of credit | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	18,635	24,990
Acquired Loans | Home equity lines of credit | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	88	88
Acquired Loans | Home equity lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	393	378
Acquired Loans | Home equity lines of credit | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Acquired Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	268	1,883
Acquired Loans | Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	268	1,525
Acquired Loans | Consumer | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	358
Acquired Loans | Consumer | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Acquired Loans | Consumer | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 0	$ 0

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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.

+ 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

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