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Loans and Allowance for Loan Losses - Past Due Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | $ 1,811 | $ 1,764
Total Past Due and NonAccrual | 4,762 | 5,269
Current Loans | 1,339,659 | 1,285,195
Total loans | 1,374,257 | 1,323,258
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 6 | 128
Total Past Due and NonAccrual | 1,210 | 1,373
Current Loans | 646,248 | 623,712
Total loans | 663,694 | 642,988
Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 1,085 | 991
Total Past Due and NonAccrual | 1,673 | 1,987
Current Loans | 290,489 | 284,020
Total loans | 299,147 | 293,457
Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 547 | 547
Total Past Due and NonAccrual | 1,119 | 938
Current Loans | 136,582 | 129,351
Total loans | 142,704 | 135,409
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 83 | 85
Total Past Due and NonAccrual | 536 | 502
Current Loans | 255,148 | 236,727
Total loans | 256,333 | 238,087
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 90 | 13
Total Past Due and NonAccrual | 224 | 469
Current Loans | 11,192 | 11,385
Total loans | 12,379 | 13,317
Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 29,836 | 32,794
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 16,236 | 17,903
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 6,985 | 7,450
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 5,003 | 5,120
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 649 | 858
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 963 | 1,463
30-89 Days Past Due and Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded investment, past due | 2,153 | 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 | 1,039 | 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 | 458 | 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 | 238 | 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 | 315 | 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 | 103 | 165
Past Due 90 Days or More and Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded investment, past due | 798 | 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 | 165 | 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 | 130 | 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 | 334 | 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 | 138 | 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 | $ 31 | $ 291

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