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Loans and Investments, Charge-offs and Recoveries Narratives (Details) | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) loan | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) loan | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loans and Investments |  |  |  |  |  |
Number of loans for which no provision for loan loss made | loan | 0 |  |  | 0 |  |
Provision for loan losses | $ 83,255,922 | $ 81,255,922 | $ 83,711,575 | $ 83,816,575 | $ 83,831,575 | $ 86,761,575
Six loans collateralized by a land development project | Maturity Date September 2018 |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |
Number of loans with unpaid principal balance | loan | 6 |  |  |  |  |
Carrying value of impaired loan | $ 120,500,000 |  |  |  |  |
Five loans collateralized by a land development project | Maturity Date September 2018 |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |
Number of loans with unpaid principal balance | loan | 5 |  |  |  |  |
Carrying value of impaired loan | $ 111,200,000 |  |  |  |  |
Weighted average accrual rate of interest (as a percent) | 8.50% |  |  |  |  |
Provision for loan losses | $ 49,100,000 |  |  |  |  |

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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