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Loans and Allowance for Loan Losses - Impaired Loan Portfolio (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with a valuation allowance, Related Allowance | $ 285 | $ 461
Total impaired loans, Recorded Investment | 3,620 | 2,657
Total impaired loans, Unpaid Principal Balance | 3,763 | 2,826
Total impaired loans, Average Recorded Investment | 3,129 | 2,005
Total impaired loans, Interest Income Recognized | 84 | 129
Non PCI Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 2,813 | 1,427
Impaired loans without a valuation allowance, Unpaid Principal Balance | 2,837 | 1,462
Impaired loans without a valuation allowance, Average Recorded Investment | 2,188 | 1,277
Impaired loans without a valuation allowance, Interest Income Recognized | 55 | 63
Impaired loans with a valuation allowance, Recorded Investment | 777 | 1,214
Impaired loans with a valuation allowance, Unpaid Principal Balance | 799 | 1,241
Impaired loans with a valuation allowance, Related Allowance | 266 | 445
Impaired loans with a valuation allowance, Average Recorded Investment | 930 | 725
Impaired loans with a valuation allowance, Interest Income Recognized | 26 | 50
Non PCI Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 1,198 | 424
Impaired loans without a valuation allowance, Unpaid Principal Balance | 1,211 | 454
Impaired loans without a valuation allowance, Average Recorded Investment | 802 | 204
Impaired loans without a valuation allowance, Interest Income Recognized | 27 | 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 | 6 | 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 | 981 | 415
Impaired loans without a valuation allowance, Unpaid Principal Balance | 992 | 420
Impaired loans without a valuation allowance, Average Recorded Investment | 769 | 401
Impaired loans without a valuation allowance, Interest Income Recognized | 22 | 16
Impaired loans with a valuation allowance, Recorded Investment | 376 | 1,007
Impaired loans with a valuation allowance, Unpaid Principal Balance | 388 | 1,033
Impaired loans with a valuation allowance, Related Allowance | 87 | 256
Impaired loans with a valuation allowance, Average Recorded Investment | 576 | 601
Impaired loans with a valuation allowance, Interest Income Recognized | 13 | 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 | 72 | 41
Impaired loans without a valuation allowance, Unpaid Principal Balance | 73 | 41
Impaired loans without a valuation allowance, Average Recorded Investment | 62 | 44
Impaired loans without a valuation allowance, Interest Income Recognized | 5 | 3
Impaired loans with a valuation allowance, Recorded Investment | 348 | 172
Impaired loans with a valuation allowance, Unpaid Principal Balance | 354 | 172
Impaired loans with a valuation allowance, Related Allowance | 142 | 172
Impaired loans with a valuation allowance, Average Recorded Investment | 280 | 117
Impaired loans with a valuation allowance, Interest Income Recognized | 10 | 10
Non PCI Loans [Member] | Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 15 | 0
Impaired loans without a valuation allowance, Unpaid Principal Balance | 14 | 0
Impaired loans without a valuation allowance, Average Recorded Investment | 8 | 0
Impaired loans without a valuation allowance, Interest Income Recognized | 1 | 0
Impaired loans with a valuation allowance, Recorded Investment | 53 | 12
Impaired loans with a valuation allowance, Unpaid Principal Balance | 57 | 13
Impaired loans with a valuation allowance, Related Allowance | 37 | 12
Impaired loans with a valuation allowance, Average Recorded Investment | 68 | 2
Impaired loans with a valuation allowance, Interest Income Recognized | 3 | 1
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with a valuation allowance, Recorded Investment | 30 | 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 | 11 | 3
Impaired loans with a valuation allowance, Interest Income Recognized | $ 3 | $ 16

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