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Loans - Schedule of Classes of the Loan Portfolio Summarized by the Aggregate Risk Rating (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 1,237,754	$ 1,244,170	$ 952,476
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,176,406	1,183,405
Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	43,853	42,084
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	17,495	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	162,463	165,829	162,997
Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	157,753	160,297
Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,448	3,710
Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,262	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	509,747	492,759	335,640
Commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	464,972	449,854
Commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	32,479	30,400
Commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	12,296	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	21,073	35,560	18,311
Commercial real estate construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	19,656	34,155
Commercial real estate construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,167	1,155
Commercial real estate construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	250	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	423,944	425,893	349,716
Residential mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	414,976	416,154
Residential mortgage | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,666	6,013
Residential mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,302	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	104,492	107,792	71,336
Home equity lines of credit | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	103,370	106,966
Home equity lines of credit | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	737	448
Home equity lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	385	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	16,035	16,337	$ 14,476
Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	15,679	15,979
Consumer | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	356	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	1,010,097	1,003,544
Originated Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	972,537	966,217
Originated Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	27,748	25,510
Originated Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,812	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	156,662	159,455
Originated Loans | Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	152,154	154,177
Originated Loans | Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,249	3,466
Originated Loans | Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,259	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	370,924	351,945
Originated Loans | Commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	342,702	325,002
Originated Loans | Commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	20,020	17,666
Originated Loans | Commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	8,202	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	15,484	28,430
Originated Loans | Commercial real estate construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,449	27,413
Originated Loans | Commercial real estate construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	785	767
Originated Loans | Commercial real estate construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	250	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	370,466	366,924
Originated Loans | Residential mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	367,120	363,195
Originated Loans | Residential mortgage | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,245	3,251
Originated Loans | Residential mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	101	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	82,294	82,336
Originated Loans | Home equity lines of credit | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	81,845	81,976
Originated Loans | Home equity lines of credit | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	449	360
Originated Loans | Home equity lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	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	14,267	14,454
Originated Loans | Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,267	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	227,657	240,626
Acquired Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	203,869	217,188
Acquired Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	16,105	16,574
Acquired Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	7,683	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	5,801	6,374
Acquired Loans | Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,599	6,120
Acquired Loans | Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	199	244
Acquired Loans | Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3	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	138,823	140,814
Acquired Loans | Commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	122,270	124,852
Acquired Loans | Commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	12,459	12,734
Acquired Loans | Commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,094	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	5,589	7,130
Acquired Loans | Commercial real estate construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,207	6,742
Acquired Loans | Commercial real estate construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	382	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	53,478	58,969
Acquired Loans | Residential mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	47,856	52,959
Acquired Loans | Residential mortgage | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,421	2,762
Acquired Loans | Residential mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,201	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	22,198	25,456
Acquired Loans | Home equity lines of credit | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	21,525	24,990
Acquired Loans | Home equity lines of credit | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	288	88
Acquired Loans | Home equity lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	385	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	1,768	1,883
Acquired Loans | Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,412	1,525
Acquired Loans | Consumer | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	356	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://www.xbrl.org/2003/role/presentationRef
-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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