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Income Taxes - Reconciliation of Federal Income Tax Rate (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Income (loss) before income taxes | $ 57,081,030 | $ (48,236,849) | $ 12,114,462
Computed "expected" taxes | 11,987,016 | (10,129,738) | 4,240,062
Tax-exempt interest | (1,325,197) | (1,521,090) | (3,241,530)
Proration | 357,044 | 405,204 | 518,948
Effect of tax reform |  |  | 4,752,547
Dividends received deduction | (1,913,238) | (99,726) | (508,409)
Net operating loss carryback |  | (4,210,523) |
Tax benefit on exercise of options | (64,765) | (25,938) | (873,515)
Other, net | 236,676 | 105,302 | 110,259
Pennsylvania income tax, net of federal benefit | 651,750 |  |
Income tax expense (benefit) | $ 9,929,286 | $ (15,476,509) | $ 4,998,362

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117330312&loc=d3e23163-113944 + Details
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