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Loans and Allowance for Loan Losses - Impaired Loan Portfolio (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with a valuation allowance, Related Allowance | $ 354 | $ 461
Total impaired loans, Recorded Investment | 3,232 | 2,657
Total impaired loans, Unpaid Principal Balance | 3,390 | 2,826
Total impaired loans, Average Recorded Investment | 2,963 | 2,005
Total impaired loans, Interest Income Recognized | 51 | 129
Non PCI Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 2,471 | 1,427
Impaired loans without a valuation allowance, Unpaid Principal Balance | 2,512 | 1,462
Impaired loans without a valuation allowance, Average Recorded Investment | 1,979 | 1,277
Impaired loans without a valuation allowance, Interest Income Recognized | 30 | 63
Impaired loans with a valuation allowance, Recorded Investment | 734 | 1,214
Impaired loans with a valuation allowance, Unpaid Principal Balance | 751 | 1,241
Impaired loans with a valuation allowance, Related Allowance | 335 | 445
Impaired loans with a valuation allowance, Average Recorded Investment | 979 | 725
Impaired loans with a valuation allowance, Interest Income Recognized | 18 | 50
Non PCI Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 1,034 | 424
Impaired loans without a valuation allowance, Unpaid Principal Balance | 1,043 | 454
Impaired loans without a valuation allowance, Average Recorded Investment | 670 | 204
Impaired loans without a valuation allowance, Interest Income Recognized | 15 | 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 | 8 | 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 | 793 | 415
Impaired loans without a valuation allowance, Unpaid Principal Balance | 823 | 420
Impaired loans without a valuation allowance, Average Recorded Investment | 699 | 401
Impaired loans without a valuation allowance, Interest Income Recognized | 12 | 16
Impaired loans with a valuation allowance, Recorded Investment | 203 | 1,007
Impaired loans with a valuation allowance, Unpaid Principal Balance | 216 | 1,033
Impaired loans with a valuation allowance, Related Allowance | 37 | 256
Impaired loans with a valuation allowance, Average Recorded Investment | 642 | 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 | 81 | 41
Impaired loans without a valuation allowance, Unpaid Principal Balance | 83 | 41
Impaired loans without a valuation allowance, Average Recorded Investment | 58 | 44
Impaired loans without a valuation allowance, Interest Income Recognized | 3 | 3
Impaired loans with a valuation allowance, Recorded Investment | 438 | 172
Impaired loans with a valuation allowance, Unpaid Principal Balance | 440 | 172
Impaired loans with a valuation allowance, Related Allowance | 222 | 172
Impaired loans with a valuation allowance, Average Recorded Investment | 257 | 117
Impaired loans with a valuation allowance, Interest Income Recognized | 5 | 10
Non PCI Loans [Member] | Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 16 | 0
Impaired loans without a valuation allowance, Unpaid Principal Balance | 16 | 0
Impaired loans without a valuation allowance, Average Recorded Investment | 5 | 0
Impaired loans without a valuation allowance, Interest Income Recognized | 0 | 0
Impaired loans with a valuation allowance, Recorded Investment | 93 | 12
Impaired loans with a valuation allowance, Unpaid Principal Balance | 95 | 13
Impaired loans with a valuation allowance, Related Allowance | 76 | 12
Impaired loans with a valuation allowance, Average Recorded Investment | 72 | 2
Impaired loans with a valuation allowance, Interest Income Recognized | 2 | 1
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with a valuation allowance, Recorded Investment | 27 | 16
Impaired loans with a valuation allowance, Unpaid Principal Balance | 127 | 123
Impaired loans with a valuation allowance, Related Allowance | 19 | 16
Impaired loans with a valuation allowance, Average Recorded Investment | 5 | 3
Impaired loans with a valuation allowance, Interest Income Recognized | $ 3 | $ 16

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