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Parent Company Only Condensed Financial Statements - Condensed Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividends from Bank |  |  |  |  |  |  |  |  | $ 1,055 | $ 906 | $ 449
Dividends from Other Subsidiaries |  |  |  |  |  |  |  |  | 1,500 | 1,200 | 0
Expenses: |  |  |  |  |  |  |  |  |  |  |
Interest expense-subordinated debentures and notes |  |  |  |  |  |  |  |  | 7,507 | 5,798 | 5,095
Interest expense-notes payable | $ 15,625 | $ 18,032 | $ 17,486 | $ 15,274 | $ 13,409 | $ 12,664 | $ 10,831 | $ 8,993 | 66,417 | 45,897 | 25,235
Income tax benefit | (7,246) | (7,469) | (4,479) | (4,103) | (4,899) | (1,802) | (4,881) | (3,778) | (23,297) | (15,360) | (38,327)
Net income | $ 29,090 | $ 29,069 | $ 18,424 | $ 16,156 | $ 23,529 | $ 22,516 | $ 22,251 | $ 20,921 | 92,739 | 89,217 | 48,190
Total comprehensive income |  |  |  |  |  |  |  |  | 119,770 | 84,587 | 46,113
Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividends from Bank |  |  |  |  |  |  |  |  | 60,000 | 30,000 | 20,000
Other |  |  |  |  |  |  |  |  | 663 | 1,784 | 708
Total income |  |  |  |  |  |  |  |  | 62,163 | 32,984 | 20,708
Expenses: |  |  |  |  |  |  |  |  |  |  |
Interest expense-subordinated debentures and notes |  |  |  |  |  |  |  |  | 7,507 | 5,798 | 5,094
Interest expense-notes payable |  |  |  |  |  |  |  |  | 1,182 | 62 | 89
Other expenses |  |  |  |  |  |  |  |  | 6,936 | 7,087 | 5,486
Total expenses |  |  |  |  |  |  |  |  | 15,625 | 12,947 | 10,669
Income before taxes and equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 46,538 | 20,037 | 10,039
Income tax benefit |  |  |  |  |  |  |  |  | 3,478 | 3,482 | 3,098
Net income |  |  |  |  |  |  |  |  | 50,016 | 23,519 | 13,137
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 42,723 | 65,698 | 35,053
Total comprehensive income |  |  |  |  |  |  |  |  | $ 92,739 | $ 89,217 | $ 48,190

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