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Parent Corporation Only Financial Statements (Details) - Condensed Statements of Income - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income: |  |  |  |  |  |  |  |  |  |  |
Dividend income from subsidiaries |  |  |  |  |  |  |  |  | $ 1,421 | $ 1,410 | $ 1,081
Net Income | $ 10,580 | $ 13,077 | $ 7,683 | $ 11,880 | $ (2,024) | $ 11,856 | $ 10,859 | $ 10,391 | 43,220 | 31,082 | 41,311
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Income: |  |  |  |  |  |  |  |  |  |  |
Dividend income from subsidiaries |  |  |  |  |  |  |  |  | 13,000 | 12,400 | 10,537
Other income |  |  |  |  |  |  |  |  | 13 | 8 | 7
Total Income |  |  |  |  |  |  |  |  | 13,013 | 12,408 | 10,544
Expenses |  |  |  |  |  |  |  |  | (3,251) | (3,252) | (1,705)
Income before equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 9,762 | 9,156 | 8,839
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 33,458 | 21,926 | 32,472
Net Income |  |  |  |  |  |  |  |  | $ 43,220 | $ 31,082 | $ 41,311

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