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Comprehensive Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Provision for income taxes | $ (20,511,188) | $ (37,308,163)
Amounts Reclassified from Other Comprehensive Income |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Total net reclassifications for the period | 555,523 | (105,248)
Amounts Reclassified from Other Comprehensive Income | Unrealized gains (losses) on available-for-sale debt securities |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Realized gain (loss) on sale of securities and interest rate swap | 715,591 | 253,413
Provision for income taxes | (150,274) | (88,695)
Total net reclassifications for the period | 565,317 | 164,718
Amounts Reclassified from Other Comprehensive Income | Unrealized gains (losses) on derivatives |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Realized gain (loss) on sale of securities and interest rate swap | (12,398) | (415,333)
Provision for income taxes | 2,604 | 145,367
Total net reclassifications for the period | $ (9,794) | $ (269,966)

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (b)(7) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20187-122688 + Details
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