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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Balance Sheet and Income Statement (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
ASSETS |  |  |  |
Cash and cash equivalents | $ 91,428 | $ 127,543 | $ 111,379 | $ 105,662
Other assets | 17,103 | 19,616 |  |
Total assets | 1,962,624 | 1,828,336 |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |
Accrued interest and other liabilities | 7,117 | 6,006 |  |
Total shareholders’ equity | 207,345 | 110,253 | 102,352 | 75,989
Total liabilities and shareholders' equity | 1,962,624 | 1,828,336 |  |
Income Statement [Abstract] |  |  |  |
Interest income | 71,782 | 64,708 | 56,082 |
Interest expense | 12,152 | 10,868 | 8,323 |
Income before income taxes | 22,677 | 16,836 | 14,473 |
Tax benefit | (8,238) | (4,715) | (4,362) |
Net earnings | 14,439 | 12,121 | 10,111 |
Comprehensive income | 14,799 | 12,207 | 9,362 |
Parent Company |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 14,009 | 1,645 | 1,430 | $ 865
Investment in banking subsidiaries | 208,995 | 176,979 |  |
Other assets | 511 | 1,781 |  |
Total assets | 223,515 | 180,405 |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |
Debt | 13,810 | 37,596 |  |
Accrued interest and other liabilities | 2,360 | 895 |  |
KSOP-owned shares | 0 | 31,661 |  |
Total shareholders’ equity | 207,345 | 110,253 |  |
Total liabilities and shareholders' equity | 223,515 | 180,405 |  |
Income Statement [Abstract] |  |  |  |
Interest income | 11 | 19 | 3 |
Dividends from Guaranty Bank & Trust | 0 | 12,000 | 20,000 |
Income | 11 | 12,019 | 20,003 |
Interest expense | 1,024 | 1,417 | 1,045 |
Other expenses | 1,682 | 1,406 | 1,811 |
Expenses | 2,706 | 2,823 | 2,856 |
Income before income taxes | (2,695) | 9,196 | 17,147 |
Tax benefit | 354 | 900 | 850 |
Income before equity in undistributed earnings of subsidiary | (2,341) | 10,096 | 17,997 |
Equity in undistributed earnings (loss) of subsidiary | 16,780 | 2,025 | (7,886) |
Net earnings | 14,439 | 12,121 | 10,111 |
Comprehensive income | $ 14,799 | $ 12,207 | $ 9,362 |

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