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Loans and Allowance for Loan Losses - Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 1,843	$ 1,764
Total Past Due and NonAccrual	5,758	5,269
Current Loans	1,550,288	1,285,195
Total loans	1,585,194	1,323,258
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	128
Total Past Due and NonAccrual	864	1,373
Current Loans	747,590	623,712
Total loans	766,086	642,988
Consumer Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	936	991
Total Past Due and NonAccrual	2,017	1,987
Current Loans	342,606	284,020
Total loans	350,422	293,457
Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	547	547
Total Past Due and NonAccrual	1,362	938
Current Loans	160,172	129,351
Total loans	165,906	135,409
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	311	85
Total Past Due and NonAccrual	1,208	502
Current Loans	287,814	236,727
Total loans	289,784	238,087
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	49	13
Total Past Due and NonAccrual	307	469
Current Loans	12,106	11,385
Total loans	12,996	13,317
Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	29,148	32,794
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	17,632	17,903
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	5,799	7,450
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	4,372	5,120
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	762	858
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	583	1,463
30 to 60 Days Past Due and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	2,017	1,546
30 to 60 Days Past Due and Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	341	517
30 to 60 Days Past Due and Accruing [Member] | Consumer Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	1,071	769
30 to 60 Days Past Due and Accruing [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	391	65
30 to 60 Days Past Due and Accruing [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	96	86
30 to 60 Days Past Due and Accruing [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	118	109
61 to 89 Days Past Due and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	1,055	450
61 to 89 Days Past Due and Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	222	0
61 to 89 Days Past Due and Accruing [Member] | Consumer Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	10	194
61 to 89 Days Past Due and Accruing [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	424	0
61 to 89 Days Past Due and Accruing [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	314	200
61 to 89 Days Past Due and Accruing [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	85	56
Past Due 90 Days or More and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	843	1,509
Past Due 90 Days or More and Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	301	728
Past Due 90 Days or More and Accruing [Member] | Consumer Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	0	33
Past Due 90 Days or More and Accruing [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	0	326
Past Due 90 Days or More and Accruing [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	487	131
Past Due 90 Days or More and Accruing [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	$ 55	$ 291

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