Loans - Schedule of Classes of the Loan Portfolio Summarized by the Aggregate Risk Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 1,236,370	$ 907,910	$ 872,023
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,171,687	867,398
Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	45,510	25,306
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	19,173	15,206
Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	169,037	140,344	122,926
Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	163,372	134,088
Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,525	2,355
Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,140	3,901
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	483,673	318,980	309,161
Commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	438,135	291,762
Commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	32,958	17,376
Commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	12,580	9,842
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	39,779	15,271	13,243
Commercial real estate construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	38,127	13,606
Commercial real estate construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,402	1,202
Commercial real estate construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	250	463
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	421,732	348,539	346,422
Residential mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	411,165	344,048
Residential mortgage | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,827	3,617
Residential mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,740	874
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	105,113	70,072	65,689
Home equity lines of credit | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	104,212	69,190
Home equity lines of credit | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	440	756
Home equity lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	461	126
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	17,036	14,704	$ 14,582
Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	16,676	14,704
Consumer | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	358	0
Consumer | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2	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	984,897
Originated Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	944,860
Originated Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	27,738
Originated Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	12,299
Originated Loans | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Originated Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	162,657
Originated Loans | Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	157,249
Originated Loans | Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,348
Originated Loans | Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,060
Originated Loans | Commercial and industrial | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Originated Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	340,921
Originated Loans | Commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	312,432
Originated Loans | Commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	19,134
Originated Loans | Commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,355
Originated Loans | Commercial real estate | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Originated Loans | Commercial real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	32,301
Originated Loans | Commercial real estate construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	31,042
Originated Loans | Commercial real estate construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,009
Originated Loans | Commercial real estate construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	250
Originated Loans | Commercial real estate construction | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Originated Loans | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	356,677
Originated Loans | Residential mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	352,238
Originated Loans | Residential mortgage | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,895
Originated Loans | Residential mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	544
Originated Loans | Residential mortgage | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Originated Loans | Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	77,928
Originated Loans | Home equity lines of credit | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	77,486
Originated Loans | Home equity lines of credit | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	352
Originated Loans | Home equity lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	90
Originated Loans | Home equity lines of credit | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Originated Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,413
Originated Loans | Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,413
Originated Loans | Consumer | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Originated Loans | Consumer | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Originated Loans | Consumer | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	251,473
Acquired Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	226,827
Acquired Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	17,772
Acquired Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,874
Acquired Loans | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Acquired Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,380
Acquired Loans | Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,123
Acquired Loans | Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	177
Acquired Loans | Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	80
Acquired Loans | Commercial and industrial | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Acquired Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	142,752
Acquired Loans | Commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	125,703
Acquired Loans | Commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	13,824
Acquired Loans | Commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,225
Acquired Loans | Commercial real estate | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Acquired Loans | Commercial real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	7,478
Acquired Loans | Commercial real estate construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	7,085
Acquired Loans | Commercial real estate construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	393
Acquired Loans | Commercial real estate construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Acquired Loans | Commercial real estate construction | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Acquired Loans | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	65,055
Acquired Loans | Residential mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	58,927
Acquired Loans | Residential mortgage | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,932
Acquired Loans | Residential mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,196
Acquired Loans | Residential mortgage | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Acquired Loans | Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	27,185
Acquired Loans | Home equity lines of credit | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	26,726
Acquired Loans | Home equity lines of credit | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	88
Acquired Loans | Home equity lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	371
Acquired Loans | Home equity lines of credit | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0
Acquired Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,623
Acquired Loans | Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,263
Acquired Loans | Consumer | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	358
Acquired Loans | Consumer | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2
Acquired Loans | Consumer | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 0