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Loans and Allowance for Loan Losses - Performing and Impaired Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 1,585,194 | $ 1,323,258
All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,556,046 | 1,290,464
Purchased Credit Impaired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 29,148 | 32,794
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 766,086 | 642,988
Commercial Real Estate [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 748,454 | 625,085
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 17,632 | 17,903
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 350,422 | 293,457
Consumer Real Estate [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 344,623 | 286,007
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 5,799 | 7,450
Construction and Land Development [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 165,906 | 135,409
Construction and Land Development [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 161,534 | 130,289
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 4,372 | 5,120
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 289,784 | 238,087
Commercial and Industrial [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 289,022 | 237,229
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 762 | 858
Consumer and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 12,996 | 13,317
Consumer and Other [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 12,413 | 11,854
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 583 | 1,463
Performing [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,552,456 | 1,287,823
Performing [Member] | Commercial Real Estate [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 747,256 | 624,638
Performing [Member] | Consumer Real Estate [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 343,265 | 284,585
Performing [Member] | Construction and Land Development [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 160,987 | 129,742
Performing [Member] | Commercial and Industrial [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 288,603 | 237,016
Performing [Member] | Consumer and Other [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 12,345 | 11,842
Impaired Loans [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 3,590 | 2,641
Impaired Loans [Member] | Commercial Real Estate [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,198 | 447
Impaired Loans [Member] | Consumer Real Estate [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,358 | 1,422
Impaired Loans [Member] | Construction and Land Development [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 547 | 547
Impaired Loans [Member] | Commercial and Industrial [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 419 | 213
Impaired Loans [Member] | Consumer and Other [Member] | All Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 68 | $ 12

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