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Parent Company 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] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset |  | $ 26,113 |  |  |  | $ 17,318 |  |  |  | $ 26,113 | $ 17,318 |
Expenses |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  | 7,618 | $ 6,641 | $ 5,999 | $ 5,278 | 5,044 | $ 4,705 | $ 4,378 | $ 4,207 | 25,536 | 18,334 | $ 18,793
Income tax benefit |  | 8,258 | 9,969 | 9,249 | 6,828 | 14,915 | 12,681 | 10,731 | 9,014 | 34,304 | 47,341 | 35,427
Net Income |  | 29,934 | $ 33,015 | $ 31,118 | $ 27,555 | 22,064 | $ 23,852 | $ 20,563 | $ 20,725 | 121,622 | 87,204 | 76,648
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividend Income, Operating | [1] |  |  |  |  |  |  |  |  | 71,255 | 47,006 | 44,598
Derivative Asset | [2] | $ 1,711 |  |  |  | $ 1,535 |  |  |  | 1,711 | 1,535 |
Income |  |  |  |  |  |  |  |  |  |  |  |
Interest income(2) | [3] |  |  |  |  |  |  |  |  |  | 50 | 98
Total income |  |  |  |  |  |  |  |  |  | 71,255 | 47,056 | 44,696
Expenses |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | 4,234 | 3,995 | 5,901
Total expenses |  |  |  |  |  |  |  |  |  | 4,234 | 3,995 | 5,901
Income before income taxes and equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  |  | 67,021 | 43,061 | 38,795
Income tax benefit |  |  |  |  |  |  |  |  |  | (1,151) | (1,523) | (1,791)
Income of parent company |  |  |  |  |  |  |  |  |  | 68,172 | 44,584 | 40,586
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  |  | 53,450 | 42,620 | 36,062
Net Income |  |  |  |  |  |  |  |  |  | $ 121,622 | $ 87,204 | $ 76,648
[1] | eliminates in consolidation.
[2] | Entire balance eliminates in consolidation.
[3] | Entire balance eliminated in consolidation.

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