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Loans and Allowance for Loan Losses - Loan Risk Rating (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 1,374,257 | $ 1,323,258
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 663,694 | 642,988
Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 299,147 | 293,457
Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 142,704 | 135,409
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 256,333 | 238,087
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 12,379 | 13,317
Non PCI Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,344,421 | 1,290,464
Non PCI Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,335,233 | 1,270,417
Non PCI Loans [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 6,168 | 13,668
Non PCI Loans [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 12 | 3,852
Non PCI Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,963 | 2,241
Non PCI Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 45 | 286
Non PCI Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 647,458 | 625,085
Non PCI Loans [Member] | Commercial Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 645,238 | 616,028
Non PCI Loans [Member] | Commercial Real Estate [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,660 | 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 | 560 | 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 | 292,162 | 286,007
Non PCI Loans [Member] | Consumer Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 287,350 | 279,464
Non PCI Loans [Member] | Consumer Real Estate [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 3,227 | 2,543
Non PCI Loans [Member] | Consumer Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 12 | 2,627
Non PCI Loans [Member] | Consumer Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,573 | 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 | 137,701 | 130,289
Non PCI Loans [Member] | Construction and Land Development [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 137,154 | 129,359
Non PCI Loans [Member] | Construction and Land Development [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 383
Non PCI Loans [Member] | Construction and Land Development [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 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 | 255,684 | 237,229
Non PCI Loans [Member] | Commercial and Industrial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 254,341 | 233,942
Non PCI Loans [Member] | Commercial and Industrial [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,154 | 3,007
Non PCI Loans [Member] | Commercial and Industrial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 64
Non PCI Loans [Member] | Commercial and Industrial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 169 | 157
Non PCI Loans [Member] | Commercial and Industrial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 20 | 59
Non PCI Loans [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 11,416 | 11,854
Non PCI Loans [Member] | Consumer and Other [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 11,150 | 11,624
Non PCI Loans [Member] | Consumer and Other [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 127 | 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 | 114 | 0
Non PCI Loans [Member] | Consumer and Other [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 25 | 13
Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 29,836 | 32,794
Purchased Credit Impaired Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 22,681 | 23,558
Purchased Credit Impaired Loans [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 3,546 | 2,637
Purchased Credit Impaired Loans [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 59 | 538
Purchased Credit Impaired Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 3,537 | 5,308
Purchased Credit Impaired Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 13 | 753
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 16,236 | 17,903
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 13,474 | 14,386
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,590 | 261
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 0
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,172 | 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 | 6,985 | 7,450
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,257 | 4,151
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,281 | 1,345
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 456
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,447 | 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 | 5,003 | 5,120
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,008 | 4,134
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 651 | 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 | 344 | 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 | 649 | 858
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 99 | 68
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 3 | 120
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 59 | 58
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 475 | 588
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 13 | 24
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 963 | 1,463
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 843 | 819
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 21 | 262
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 24
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 99 | 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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