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Loans and Allowance for Loan Losses - Loan Risk Rating (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 1,585,194 | $ 1,323,258
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 766,086 | 642,988
Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 350,422 | 293,457
Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 165,906 | 135,409
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 289,784 | 238,087
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 12,996 | 13,317
Non PCI Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,556,046 | 1,290,464
Non PCI Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,544,211 | 1,270,417
Non PCI Loans [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 7,504 | 13,668
Non PCI Loans [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,337 | 3,852
Non PCI Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,985 | 2,241
Non PCI Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 9 | 286
Non PCI Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 748,454 | 625,085
Non PCI Loans [Member] | Commercial Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 743,995 | 616,028
Non PCI Loans [Member] | Commercial Real Estate [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 3,833 | 7,673
Non PCI Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 1,006
Non PCI Loans [Member] | Commercial Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 626 | 378
Non PCI Loans [Member] | Commercial Real Estate [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 0
Non PCI Loans [Member] | Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 344,623 | 286,007
Non PCI Loans [Member] | Consumer Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 339,665 | 279,464
Non PCI Loans [Member] | Consumer Real Estate [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 3,082 | 2,543
Non PCI Loans [Member] | Consumer Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 546 | 2,627
Non PCI Loans [Member] | Consumer Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,330 | 1,159
Non PCI Loans [Member] | Consumer Real Estate [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 214
Non PCI Loans [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 161,534 | 130,289
Non PCI Loans [Member] | Construction and Land Development [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 160,767 | 129,359
Non PCI Loans [Member] | Construction and Land Development [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 61 | 383
Non PCI Loans [Member] | Construction and Land Development [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 159 | 0
Non PCI Loans [Member] | Construction and Land Development [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 547 | 547
Non PCI Loans [Member] | Construction and Land Development [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 0
Non PCI Loans [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 289,022 | 237,229
Non PCI Loans [Member] | Commercial and Industrial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 287,585 | 233,942
Non PCI Loans [Member] | Commercial and Industrial [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 409 | 3,007
Non PCI Loans [Member] | Commercial and Industrial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 632 | 64
Non PCI Loans [Member] | Commercial and Industrial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 387 | 157
Non PCI Loans [Member] | Commercial and Industrial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 9 | 59
Non PCI Loans [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 12,413 | 11,854
Non PCI Loans [Member] | Consumer and Other [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 12,199 | 11,624
Non PCI Loans [Member] | Consumer and Other [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 119 | 62
Non PCI Loans [Member] | Consumer and Other [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 155
Non PCI Loans [Member] | Consumer and Other [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 95 | 0
Non PCI Loans [Member] | Consumer and Other [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 13
Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 29,148 | 32,794
Purchased Credit Impaired Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 21,778 | 23,558
Purchased Credit Impaired Loans [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,972 | 2,637
Purchased Credit Impaired Loans [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,752 | 538
Purchased Credit Impaired Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,646 | 5,308
Purchased Credit Impaired Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 753
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 17,632 | 17,903
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 13,897 | 14,386
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,484 | 261
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,379 | 0
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 872 | 3,084
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 172
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 5,799 | 7,450
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 3,464 | 4,151
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 823 | 1,345
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 241 | 456
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,271 | 1,192
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 306
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,372 | 5,120
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 3,725 | 4,134
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 647 | 649
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 0
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 337
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 0
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 762 | 858
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 214 | 68
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 120
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 119 | 58
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 429 | 588
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 24
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 583 | 1,463
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 478 | 819
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 18 | 262
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 13 | 24
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 74 | 107
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 0 | $ 251

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