Loans and Allowance for Loan Losses - Summary of Loan Balances by Category as well as Risk Rating (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 1,467,786	$ 1,429,794
Total Impaired Loans
Financing Receivable Recorded Investment [Line Items]
Total loans	3,835	3,898
Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Total loans	1,463,951	1,425,896
Performing Financial Instruments | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	1,443,540	1,406,656
Performing Financial Instruments | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	10,515	9,696
Performing Financial Instruments | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	9,896	9,544
Commercial real estate
Financing Receivable Recorded Investment [Line Items]
Total loans	574,001	550,446
Commercial real estate | Total Impaired Loans
Financing Receivable Recorded Investment [Line Items]
Total loans	1,371	1,391
Commercial real estate | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Total loans	572,630	549,055
Commercial real estate | Performing Financial Instruments | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	571,234	547,616
Commercial real estate | Performing Financial Instruments | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	173	177
Commercial real estate | Performing Financial Instruments | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	1,223	1,262
Consumer real estate
Financing Receivable Recorded Investment [Line Items]
Total loans	248,943	253,562
Consumer real estate | Total Impaired Loans
Financing Receivable Recorded Investment [Line Items]
Total loans	953	922
Consumer real estate | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Total loans	247,990	252,640
Consumer real estate | Performing Financial Instruments | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	244,890	249,273
Consumer real estate | Performing Financial Instruments | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	1,753	1,676
Consumer real estate | Performing Financial Instruments | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	1,347	1,691
Construction and land development
Financing Receivable Recorded Investment [Line Items]
Total loans	162,237	174,670
Construction and land development | Total Impaired Loans
Financing Receivable Recorded Investment [Line Items]
Total loans	8	8
Construction and land development | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Total loans	162,229	174,662
Construction and land development | Performing Financial Instruments | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	162,160	174,591
Construction and land development | Performing Financial Instruments | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	51	52
Construction and land development | Performing Financial Instruments | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	18	19
Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Total loans	419,941	404,600
Commercial and industrial | Total Impaired Loans
Financing Receivable Recorded Investment [Line Items]
Total loans	1,456	1,546
Commercial and industrial | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Total loans	418,485	403,054
Commercial and industrial | Performing Financial Instruments | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	402,650	388,719
Commercial and industrial | Performing Financial Instruments | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	8,537	7,790
Commercial and industrial | Performing Financial Instruments | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	7,298	6,545
Consumer
Financing Receivable Recorded Investment [Line Items]
Total loans	26,241	25,615
Consumer | Total Impaired Loans
Financing Receivable Recorded Investment [Line Items]
Total loans	47	31
Consumer | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Total loans	26,194	25,584
Consumer | Performing Financial Instruments | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	26,183	25,556
Consumer | Performing Financial Instruments | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	1	1
Consumer | Performing Financial Instruments | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	10	27
Other
Financing Receivable Recorded Investment [Line Items]
Total loans	36,423	20,901
Other | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Total loans	36,423	20,901
Other | Performing Financial Instruments | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 36,423	$ 20,901