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Condensed Parent Only Financial Information Condensed Income Statement (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest expense | $ 17,115 | $ 17,094 | $ 16,931 | $ 16,202 | $ 15,358 | $ 14,883 | $ 15,479 | $ 14,888 | $ 67,342 | $ 60,609 | $ 63,328
Non-interest income |  |  |  |  |  |  |  |  |  |  |
Total non-interest income | 4,648 | 4,871 | 3,982 | 4,667 | 3,525 | 4,339 | 4,738 | 4,063 | 18,167 | 16,665 | 17,988
Non-interest expense | 18,244 | 15,746 | 14,467 | 13,907 | 14,859 | 14,231 | 14,221 | 13,560 | 62,363 | 56,871 | 56,433
Loss before income tax benefit and equity in undistributed net income of consolidated subsidiaries | 2,536 | 6,765 | 3,867 | 4,486 | 3,551 | 3,520 | 2,340 | 4,819 | 17,654 | 14,231 | 17,065
Income tax benefit | 1,528 | (1,464) | (578) | (837) | 486 | (936) | (454) | (1,422) | 1,351 | 2,326 | 2,156
Net income | $ 4,064 | $ 5,301 | $ 3,289 | $ 3,649 | $ 4,037 | $ 2,584 | $ 1,886 | $ 3,397 | 16,303 | 11,905 | 14,909
Parent company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest expense |  |  |  |  |  |  |  |  | 2,703 | 2,744 | 2,799
Non-interest income |  |  |  |  |  |  |  |  |  |  |
Consulting and rental income from consolidated subsidiaries |  |  |  |  |  |  |  |  | 20,267 | 19,139 | 16,036
Other non-interest income |  |  |  |  |  |  |  |  | 33 | 34 | 33
Total non-interest income |  |  |  |  |  |  |  |  | 20,300 | 19,173 | 16,069
Non-interest expense |  |  |  |  |  |  |  |  | 22,866 | 21,575 | 19,250
Loss before income tax benefit and equity in undistributed net income of consolidated subsidiaries |  |  |  |  |  |  |  |  | 5,269 | 5,146 | 5,980
Income tax benefit |  |  |  |  |  |  |  |  | 1,478 | 1,965 | 2,170
Loss before equity in undistributed net income of consolidated subsidiaries |  |  |  |  |  |  |  |  | 3,791 | 3,181 | 3,810
Equity in undistributed net income of consolidated subsidiaries |  |  |  |  |  |  |  |  | 20,094 | 15,086 | 18,719
Net income |  |  |  |  |  |  |  |  | $ 16,303 | $ 11,905 | $ 14,909

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