Loans and Allowance for Loan Losses - Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 2,564	$ 2,696
Total Past Due and Nonaccrual	5,441	5,921
Current Loans	1,832,443	1,737,160
Total loans	1,867,747	1,777,239
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	124	272
Total Past Due and Nonaccrual	299	668
Current Loans	872,283	841,677
Total loans	890,462	860,027
Consumer Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,403	844
Total Past Due and Nonaccrual	2,612	2,928
Current Loans	396,247	395,614
Total loans	405,531	407,254
Construction and Land Development [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	621	547
Total Past Due and Nonaccrual	892	890
Current Loans	214,230	182,403
Total loans	219,751	187,895
Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	377	909
Total Past Due and Nonaccrual	1,322	1,165
Current Loans	339,546	304,532
Total loans	341,207	308,254
Consumer and Other [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	39	124
Total Past Due and Nonaccrual	316	270
Current Loans	10,137	12,934
Total loans	10,796	13,809
Purchased Credit Impaired Loans [Member]
Financing Receivable, Past Due [Line Items]
Total loans	29,863
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total loans	17,880
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total loans	6,672
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Past Due [Line Items]
Total loans	4,629
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Total loans	339
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member]
Financing Receivable, Past Due [Line Items]
Total loans	343
30 to 60 Days Past Due and Accruing [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	1,635	2,160
30 to 60 Days Past Due and Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	175	377
30 to 60 Days Past Due and Accruing [Member] | Consumer Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	321	1,168
30 to 60 Days Past Due and Accruing [Member] | Construction and Land Development [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	271	343
30 to 60 Days Past Due and Accruing [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	684	155
30 to 60 Days Past Due and Accruing [Member] | Consumer and Other [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	184	117
61 to 89 Days Past Due and Accruing [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	634	481
61 to 89 Days Past Due and Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	0	19
61 to 89 Days Past Due and Accruing [Member] | Consumer Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	391	462
61 to 89 Days Past Due and Accruing [Member] | Construction and Land Development [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	0	0
61 to 89 Days Past Due and Accruing [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	166	0
61 to 89 Days Past Due and Accruing [Member] | Consumer and Other [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	77	0
Past Due 90 Days or More and Accruing [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	608	584
Past Due 90 Days or More and Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	0	0
Past Due 90 Days or More and Accruing [Member] | Consumer Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	497	454
Past Due 90 Days or More and Accruing [Member] | Construction and Land Development [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	0	0
Past Due 90 Days or More and Accruing [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	95	101
Past Due 90 Days or More and Accruing [Member] | Consumer and Other [Member]
Financing Receivable, Past Due [Line Items]
Recorded investment, past due	$ 16	$ 29