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Parent Company Condensed Financial Information - Condensed Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Expenses |  |  |
Junior subordinated debentures | $ 2,215 | $ 3,724 | $ 3,716
Senior notes | 2,692 | 2,699 | 2,688
Income before income taxes and equity in undistributed net income of subsidiaries | 37,408 | 51,857 | 43,936
Income tax benefit | 9,583 | 12,402 | 9,924
Net income available to common stockholders | 27,825 | 39,455 | 34,012
Parent Company [Member] |  |  |
Operating Income |  |  |
Cash dividends received from subsidiaries | 41,300 | 20,000 | 30,000
Other income | 32 | 109 | 106
Total operating income | 41,332 | 20,109 | 30,106
Operating Expenses |  |  |
Junior subordinated debentures | 2,216 | 3,724 | 3,716
Senior notes | 2,693 | 2,700 | 2,688
Notes payable | 362 |  |
Other interest expense |  | 13 | 98
Other expenses | 3,669 | 4,025 | 4,208
Total operating expense | 8,940 | 10,462 | 10,710
Income before income taxes and equity in undistributed net income of subsidiaries | 32,392 | 9,647 | 19,396
Income tax benefit | (2,215) | (3,187) | (3,355)
Income before equity in undistributed net income of subsidiaries | 34,607 | 12,834 | 22,751
Equity in undistributed net income of subsidiaries | (6,782) | 26,621 | 11,261
Net income available to common stockholders | $ 27,825 | $ 39,455 | $ 34,012

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