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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, 2019 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with a valuation allowance, Related Allowance | $ 274 | $ 534
Total impaired loans, Recorded Investment | 6,243 | 3,559
Total impaired loans, Unpaid Principal Balance | 6,768 | 3,652
Total impaired loans, Average Recorded Investment | 4,295 | 3,358
Total impaired loans, Interest Income Recognized | 29 | 111
Non PCI Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 2,109 | 2,354
Impaired loans without a valuation allowance, Unpaid Principal Balance | 2,142 | 2,387
Impaired loans without a valuation allowance, Average Recorded Investment | 2,231 | 2,420
Impaired loans without a valuation allowance, Interest Income Recognized | 26 | 71
Impaired loans with a valuation allowance, Recorded Investment | 498 | 1,205
Impaired loans with a valuation allowance, Unpaid Principal Balance | 518 | 1,265
Impaired loans with a valuation allowance, Related Allowance | 220 | 534
Impaired loans with a valuation allowance, Average Recorded Investment | 852 | 927
Impaired loans with a valuation allowance, Interest Income Recognized | 10 | 40
Non PCI Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 589 | 636
Impaired loans without a valuation allowance, Unpaid Principal Balance | 601 | 648
Impaired loans without a valuation allowance, Average Recorded Investment | 613 | 855
Impaired loans without a valuation allowance, Interest Income Recognized | 20 | 33
Impaired loans with a valuation allowance, Recorded Investment | 47 | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 47 | 0
Impaired loans with a valuation allowance, Related Allowance | 11 | 0
Impaired loans with a valuation allowance, Average Recorded Investment | 24 | 0
Impaired loans with a valuation allowance, Interest Income Recognized | 1 | 0
Non PCI Loans [Member] | Consumer Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 863 | 1,073
Impaired loans without a valuation allowance, Unpaid Principal Balance | 879 | 1,089
Impaired loans without a valuation allowance, Average Recorded Investment | 967 | 934
Impaired loans without a valuation allowance, Interest Income Recognized | 4 | 29
Impaired loans with a valuation allowance, Recorded Investment | 35 | 163
Impaired loans with a valuation allowance, Unpaid Principal Balance | 40 | 205
Impaired loans with a valuation allowance, Related Allowance | 33 | 26
Impaired loans with a valuation allowance, Average Recorded Investment | 99 | 365
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 0
Non PCI Loans [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 599 | 547
Impaired loans without a valuation allowance, Unpaid Principal Balance | 599 | 547
Impaired loans without a valuation allowance, Average Recorded Investment | 573 | 547
Impaired loans without a valuation allowance, Interest Income Recognized | 0 | 0
Impaired loans with a valuation allowance, Recorded Investment | 56 | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 56 | 0
Impaired loans with a valuation allowance, Related Allowance | 8 | 0
Impaired loans with a valuation allowance, Average Recorded Investment | 28 | 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 | 31 | 69
Impaired loans without a valuation allowance, Unpaid Principal Balance | 32 | 70
Impaired loans without a valuation allowance, Average Recorded Investment | 50 | 69
Impaired loans without a valuation allowance, Interest Income Recognized | 1 | 6
Impaired loans with a valuation allowance, Recorded Investment | 334 | 955
Impaired loans with a valuation allowance, Unpaid Principal Balance | 349 | 973
Impaired loans with a valuation allowance, Related Allowance | 164 | 442
Impaired loans with a valuation allowance, Average Recorded Investment | 644 | 476
Impaired loans with a valuation allowance, Interest Income Recognized | 9 | 37
Non PCI Loans [Member] | Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 27 | 29
Impaired loans without a valuation allowance, Unpaid Principal Balance | 31 | 33
Impaired loans without a valuation allowance, Average Recorded Investment | 28 | 15
Impaired loans without a valuation allowance, Interest Income Recognized | 1 | 3
Impaired loans with a valuation allowance, Recorded Investment | 26 | 87
Impaired loans with a valuation allowance, Unpaid Principal Balance | 26 | 87
Impaired loans with a valuation allowance, Related Allowance | 4 | 66
Impaired loans with a valuation allowance, Average Recorded Investment | 57 | 86
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 3
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with a valuation allowance, Recorded Investment | 2,535 | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 2,837 | 0
Impaired loans with a valuation allowance, Related Allowance | 40 | 0
Impaired loans with a valuation allowance, Average Recorded Investment | 845 | 11
Impaired loans with a valuation allowance, Interest Income Recognized | (10) | $ 0
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with a valuation allowance, Recorded Investment | 1,101 |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 1,271 |
Impaired loans with a valuation allowance, Related Allowance | 14 |
Impaired loans with a valuation allowance, Average Recorded Investment | 367 |
Impaired loans with a valuation allowance, Interest Income Recognized | $ 3 |

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