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Loans and Allowance for Loan Losses - Impaired Loan Portfolio (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with a valuation allowance, Related Allowance | $ 369 | $ 461
Total impaired loans, Recorded Investment | 3,027 | 2,657
Total impaired loans, Unpaid Principal Balance | 3,096 | 2,826
Total impaired loans, Average Recorded Investment | 2,836 | 2,005
Total impaired loans, Interest Income Recognized | 29 | 129
Non PCI Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 2,038 | 1,427
Impaired loans without a valuation allowance, Unpaid Principal Balance | 2,092 | 1,462
Impaired loans without a valuation allowance, Average Recorded Investment | 1,733 | 1,277
Impaired loans without a valuation allowance, Interest Income Recognized | 16 | 63
Impaired loans with a valuation allowance, Recorded Investment | 989 | 1,214
Impaired loans with a valuation allowance, Unpaid Principal Balance | 1,004 | 1,241
Impaired loans with a valuation allowance, Related Allowance | 369 | 445
Impaired loans with a valuation allowance, Average Recorded Investment | 1,103 | 725
Impaired loans with a valuation allowance, Interest Income Recognized | 13 | 50
Non PCI Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 550 | 424
Impaired loans without a valuation allowance, Unpaid Principal Balance | 565 | 454
Impaired loans without a valuation allowance, Average Recorded Investment | 487 | 204
Impaired loans without a valuation allowance, Interest Income Recognized | 10 | 44
Impaired loans with a valuation allowance, Recorded Investment | 0 | 23
Impaired loans with a valuation allowance, Unpaid Principal Balance | 0 | 23
Impaired loans with a valuation allowance, Related Allowance | 0 | 5
Impaired loans with a valuation allowance, Average Recorded Investment | 12 | 5
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 1
Non PCI Loans [Member] | Consumer Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 889 | 415
Impaired loans without a valuation allowance, Unpaid Principal Balance | 929 | 420
Impaired loans without a valuation allowance, Average Recorded Investment | 652 | 401
Impaired loans without a valuation allowance, Interest Income Recognized | 5 | 16
Impaired loans with a valuation allowance, Recorded Investment | 716 | 1,007
Impaired loans with a valuation allowance, Unpaid Principal Balance | 729 | 1,033
Impaired loans with a valuation allowance, Related Allowance | 192 | 256
Impaired loans with a valuation allowance, Average Recorded Investment | 862 | 601
Impaired loans with a valuation allowance, Interest Income Recognized | 11 | 38
Non PCI Loans [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 547 | 547
Impaired loans without a valuation allowance, Unpaid Principal Balance | 547 | 547
Impaired loans without a valuation allowance, Average Recorded Investment | 547 | 628
Impaired loans without a valuation allowance, Interest Income Recognized | 0 | 0
Impaired loans with a valuation allowance, Recorded Investment | 0 | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 0 | 0
Impaired loans with a valuation allowance, Related Allowance | 0 | 0
Impaired loans with a valuation allowance, Average Recorded Investment | 0 | 0
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 0
Non PCI Loans [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 52 | 41
Impaired loans without a valuation allowance, Unpaid Principal Balance | 51 | 41
Impaired loans without a valuation allowance, Average Recorded Investment | 47 | 44
Impaired loans without a valuation allowance, Interest Income Recognized | 1 | 3
Impaired loans with a valuation allowance, Recorded Investment | 161 | 172
Impaired loans with a valuation allowance, Unpaid Principal Balance | 162 | 172
Impaired loans with a valuation allowance, Related Allowance | 99 | 172
Impaired loans with a valuation allowance, Average Recorded Investment | 167 | 117
Impaired loans with a valuation allowance, Interest Income Recognized | 1 | 10
Non PCI Loans [Member] | Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 0 | 0
Impaired loans without a valuation allowance, Unpaid Principal Balance | 0 | 0
Impaired loans without a valuation allowance, Average Recorded Investment | 0 | 0
Impaired loans without a valuation allowance, Interest Income Recognized | 0 | 0
Impaired loans with a valuation allowance, Recorded Investment | 112 | 12
Impaired loans with a valuation allowance, Unpaid Principal Balance | 113 | 13
Impaired loans with a valuation allowance, Related Allowance | 78 | 12
Impaired loans with a valuation allowance, Average Recorded Investment | 62 | 2
Impaired loans with a valuation allowance, Interest Income Recognized | $ 1 | 1
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with a valuation allowance, Recorded Investment |  | 16
Impaired loans with a valuation allowance, Unpaid Principal Balance |  | 123
Impaired loans with a valuation allowance, Related Allowance |  | 16
Impaired loans with a valuation allowance, Average Recorded Investment |  | 3
Impaired loans with a valuation allowance, Interest Income Recognized |  | $ 16

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