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Loans and Allowance for Loan Losses - Past Due Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | $ 1,538 | $ 1,764
Total Past Due and NonAccrual | 6,773 | 5,269
Current Loans | 1,536,004 | 1,285,195
Total loans | 1,575,435 | 1,323,258
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 6 | 128
Total Past Due and NonAccrual | 2,716 | 1,373
Current Loans | 724,674 | 623,712
Total loans | 745,864 | 642,988
Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 463 | 991
Total Past Due and NonAccrual | 1,240 | 1,987
Current Loans | 347,649 | 284,020
Total loans | 355,876 | 293,457
Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 547 | 547
Total Past Due and NonAccrual | 1,288 | 938
Current Loans | 172,453 | 129,351
Total loans | 179,431 | 135,409
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 430 | 85
Total Past Due and NonAccrual | 1,190 | 502
Current Loans | 277,760 | 236,727
Total loans | 279,771 | 238,087
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 92 | 13
Total Past Due and NonAccrual | 339 | 469
Current Loans | 13,468 | 11,385
Total loans | 14,493 | 13,317
Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 32,658 | 32,794
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 18,474 | 17,903
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 6,987 | 7,450
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 5,690 | 5,120
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 821 | 858
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 686 | 1,463
30-89 Days Past Due and Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded investment, past due | 4,568 | 1,996
30-89 Days Past Due and Accruing [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded investment, past due | 2,628 | 517
30-89 Days Past Due and Accruing [Member] | Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded investment, past due | 701 | 963
30-89 Days Past Due and Accruing [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded investment, past due | 403 | 65
30-89 Days Past Due and Accruing [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded investment, past due | 647 | 286
30-89 Days Past Due and Accruing [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded investment, past due | 189 | 165
Past Due 90 Days or More and Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded investment, past due | 667 | 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 | 82 | 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 | 76 | 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 | 338 | 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 | 113 | 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 | $ 58 | $ 291

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