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Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Interest income | $ 61,209 | $ 51,191 | $ 46,030
Interest expense | 10,333 | 8,192 | 7,501
Net interest income (loss) | 50,876 | 42,999 | 38,529
Provision for loan losses | 2,000 | 2,300 | 3,200
Noninterest income | 9,337 | 10,846 | 8,416
Noninterest expense | 34,552 | 31,176 | 28,209
Net income (loss) before taxes | 23,661 | 20,369 | 15,536
Income tax expense (benefit) | 10,616 | 7,333 | 5,369
Net income (loss) | 13,045 | 13,036 | $ 10,167
Total assets | 1,624,625 | 1,340,908 |
Commercial and Retail Banking [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 60,895 | 50,851 |
Interest expense | 9,830 | 7,792 |
Net interest income (loss) | 51,065 | 43,059 |
Provision for loan losses | 2,000 | 2,300 |
Noninterest income | 4,185 | 4,009 |
Noninterest expense | 30,568 | 26,482 |
Net income (loss) before taxes | 22,682 | 18,286 |
Income tax expense (benefit) | 10,239 | 6,496 |
Net income (loss) | 12,443 | 11,790 |
Total assets | 1,615,960 | 1,331,224 |
Mortgage Banking [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 314 | 340 |
Interest expense |  |  |
Net interest income (loss) | 314 | 340 |
Provision for loan losses |  |  |
Noninterest income | 5,152 | 6,837 |
Noninterest expense | 3,738 | 4,451 |
Net income (loss) before taxes | 1,728 | 2,726 |
Income tax expense (benefit) | 639 | 1,009 |
Net income (loss) | 1,089 | 1,717 |
Total assets | 8,230 | 6,477 |
Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 11 | 2 |
Interest expense | 514 | 402 |
Net interest income (loss) | (503) | (400) |
Provision for loan losses |  |  |
Noninterest income |  |  |
Noninterest expense | 246 | 243 |
Net income (loss) before taxes | (749) | (643) |
Income tax expense (benefit) | (262) | (172) |
Net income (loss) | (487) | (471) |
Total assets | 163,095 | 123,279 |
Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | (11) | (2) |
Interest expense | (11) | (2) |
Net interest income (loss) |  |  |
Provision for loan losses |  |  |
Noninterest income |  |  |
Noninterest expense |  |  |
Net income (loss) before taxes |  |  |
Income tax expense (benefit) |  |  |
Net income (loss) |  |  |
Total assets | $ (162,660) | $ (120,072) |

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