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Loans and Allowance for Loan Losses - Impaired Loan Portfolio (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired loans with a valuation allowance, Related Allowance | $ 399 |  | $ 399 |  | $ 534
Total impaired loans, Recorded Investment | 5,614 |  | 5,614 |  | 3,559
Total impaired loans, Unpaid Principal Balance | 6,111 |  | 6,111 |  | 3,652
Total impaired loans, Average Recorded Investment | 5,931 | $ 3,133 | 5,141 | $ 2,963 |
Total impaired loans, Interest Income Recognized | 9 | 21 | 42 | 51 |
Non PCI Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired loans without a valuation allowance, Recorded Investment | 1,345 |  | 1,345 |  | 2,354
Impaired loans without a valuation allowance, Unpaid Principal Balance | 1,350 |  | 1,350 |  | 2,387
Impaired loans without a valuation allowance, Average Recorded Investment | 1,728 | 2,256 | 1,937 | 1,979 |
Impaired loans without a valuation allowance, Interest Income Recognized | 7 | 17 | 31 | 30 |
Impaired loans with a valuation allowance, Recorded Investment | 650 |  | 650 |  | 1,205
Impaired loans with a valuation allowance, Unpaid Principal Balance | 666 |  | 666 |  | 1,265
Impaired loans with a valuation allowance, Related Allowance | 345 |  | 345 |  | 534
Impaired loans with a valuation allowance, Average Recorded Investment | 575 | 863 | 786 | 979 |
Impaired loans with a valuation allowance, Interest Income Recognized | 2 | 4 | 18 | 18 |
Non PCI Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired loans without a valuation allowance, Recorded Investment | 259 |  | 259 |  | 636
Impaired loans without a valuation allowance, Unpaid Principal Balance | 263 |  | 263 |  | 648
Impaired loans without a valuation allowance, Average Recorded Investment | 424 | 793 | 495 | 670 |
Impaired loans without a valuation allowance, Interest Income Recognized | 5 | 8 | 25 | 15 |
Impaired loans with a valuation allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Impaired loans with a valuation allowance, Related Allowance | 0 |  | 0 |  | 0
Impaired loans with a valuation allowance, Average Recorded Investment | 24 | 0 | 16 | 8 |
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 0 | 0 | 0 |
Non PCI Loans [Member] | Consumer Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired loans without a valuation allowance, Recorded Investment | 385 |  | 385 |  | 1,073
Impaired loans without a valuation allowance, Unpaid Principal Balance | 386 |  | 386 |  | 1,089
Impaired loans without a valuation allowance, Average Recorded Investment | 624 | 841 | 774 | 699 |
Impaired loans without a valuation allowance, Interest Income Recognized | 0 | 7 | 4 | 12 |
Impaired loans with a valuation allowance, Recorded Investment | 398 |  | 398 |  | 163
Impaired loans with a valuation allowance, Unpaid Principal Balance | 399 |  | 399 |  | 205
Impaired loans with a valuation allowance, Related Allowance | 240 |  | 240 |  | 26
Impaired loans with a valuation allowance, Average Recorded Investment | 217 | 460 | 199 | 642 |
Impaired loans with a valuation allowance, Interest Income Recognized | 2 | 0 | 9 | 11 |
Non PCI Loans [Member] | Construction and Land Development [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired loans without a valuation allowance, Recorded Investment | 701 |  | 701 |  | 547
Impaired loans without a valuation allowance, Unpaid Principal Balance | 701 |  | 701 |  | 547
Impaired loans without a valuation allowance, Average Recorded Investment | 650 | 547 | 616 | 547 |
Impaired loans without a valuation allowance, Interest Income Recognized | 2 | 0 | 1 | 0 |
Impaired loans with a valuation allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Impaired loans with a valuation allowance, Related Allowance | 0 |  | 0 |  | 0
Impaired loans with a valuation allowance, Average Recorded Investment | 28 | 0 | 19 | 0 |
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 0 | 0 | 0 |
Non PCI Loans [Member] | Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired loans without a valuation allowance, Recorded Investment | 0 |  | 0 |  | 69
Impaired loans without a valuation allowance, Unpaid Principal Balance | 0 |  | 0 |  | 70
Impaired loans without a valuation allowance, Average Recorded Investment | 16 | 67 | 33 | 58 |
Impaired loans without a valuation allowance, Interest Income Recognized | 0 | 2 | 1 | 3 |
Impaired loans with a valuation allowance, Recorded Investment | 252 |  | 252 |  | 955
Impaired loans with a valuation allowance, Unpaid Principal Balance | 267 |  | 267 |  | 973
Impaired loans with a valuation allowance, Related Allowance | 105 |  | 105 |  | 442
Impaired loans with a valuation allowance, Average Recorded Investment | 293 | 300 | 514 | 257 |
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 3 | 9 | 5 |
Non PCI Loans [Member] | Consumer and Other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired loans without a valuation allowance, Recorded Investment | 0 |  | 0 |  | 29
Impaired loans without a valuation allowance, Unpaid Principal Balance | 0 |  | 0 |  | 33
Impaired loans without a valuation allowance, Average Recorded Investment | 14 | 8 | 19 | 5 |
Impaired loans without a valuation allowance, Interest Income Recognized | 0 | 0 | 0 | 0 |
Impaired loans with a valuation allowance, Recorded Investment | 0 |  | 0 |  | 87
Impaired loans with a valuation allowance, Unpaid Principal Balance | 0 |  | 0 |  | 87
Impaired loans with a valuation allowance, Related Allowance | 0 |  | 0 |  | 66
Impaired loans with a valuation allowance, Average Recorded Investment | 13 | 103 | 38 | 72 |
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 1 | 0 | 2 |
Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired loans with a valuation allowance, Recorded Investment | 3,619 |  | 3,619 |  | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 4,095 |  | 4,095 |  | 0
Impaired loans with a valuation allowance, Related Allowance | 54 |  | 54 |  | 0
Impaired loans with a valuation allowance, Average Recorded Investment | 3,628 | 14 | 2,418 | 5 |
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 0 | (7) | 3 |
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired loans with a valuation allowance, Recorded Investment | 2,523 |  | 2,523 |  | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 2,834 |  | 2,834 |  | 0
Impaired loans with a valuation allowance, Related Allowance | 40 |  | 40 |  | 0
Impaired loans with a valuation allowance, Average Recorded Investment | 2,529 | 14 | 1,686 | 5 |
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 0 | (9) | 3 |
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired loans with a valuation allowance, Recorded Investment | 1,096 |  | 1,096 |  | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 1,261 |  | 1,261 |  | 0
Impaired loans with a valuation allowance, Related Allowance | 14 |  | 14 |  | $ 0
Impaired loans with a valuation allowance, Average Recorded Investment | 1,099 | 0 | 732 | 0 |
Impaired loans with a valuation allowance, Interest Income Recognized | $ 0 | $ 0 | $ 2 | $ 0 |

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