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Comprehensive Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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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
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  |  |  |  |  |  | $ (75,731,395) | $ (84,163,850) | $ (125,004,782)
Total reclassifications for the period | $ 99,547,000 | $ 111,898,000 | $ 108,959,000 | $ 104,280,000 | $ 106,275,000 | $ 111,336,000 | $ 109,024,000 | $ 111,249,000 | 424,683,939 | 437,883,097 | 406,791,922
Amounts Reclassified from Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications for the period |  |  |  |  |  |  |  |  | 382,584 | 1,682,208 | (264,257)
Amounts Reclassified from Other Comprehensive Income | Unrealized gains on available-for-sale debt securities |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) |  |  |  |  |  |  |  |  | 484,283 | 2,006,235 | 933,778
Provision for income taxes |  |  |  |  |  |  |  |  | (101,699) | (421,309) | (326,822)
Total reclassifications for the period |  |  |  |  |  |  |  |  | 382,584 | 1,584,926 | 606,956
Amounts Reclassified from Other Comprehensive Income | Unrealized gains (losses) on derivatives |  |  |  |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) |  |  |  |  |  |  |  |  | 0 | 123,142 | (1,340,329)
Provision for income taxes |  |  |  |  |  |  |  |  | 0 | (25,860) | 469,116
Total reclassifications for the period |  |  |  |  |  |  |  |  | $ 0 | $ 97,282 | $ (871,213)

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