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Fair Value, Measurement on Recurring and Nonrecurring Basis (Details)	3 Months Ended	6 Months Ended	9 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2017 USD ($) item	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Financial assets:
Available-for-sale securities			$ 4,707,085		$ 5,403,463
Allowance for loan losses	$ (83,831,575)	$ (81,255,922)	$ (83,255,922)	$ (83,816,575)	(83,711,575)	$ (86,761,575)
Number of impaired loans | item			6
Impairment loss on real estate owned			$ 2,700,000	$ 11,200,000
Non-financial assets:
Long-lived asset			17,354,720		19,491,805
Real Estate Owned
Non-financial assets:
Long-lived asset			17,354,720		19,491,805
Hotel | Real Estate Owned
Financial assets:
Impairment loss on real estate owned	$ 11,200,000	$ 2,700,000
Non-financial assets:
Long-lived asset			11,540,664		13,908,812
Carrying Value
Financial assets:
Available-for-sale securities			4,707,085		5,403,463
Derivative financial instruments			488,747		5,614,990
Financial liabilities:
Derivative financial instruments			1,881,450		2,451,422
Fair Value
Financial assets:
Available-for-sale securities			4,707,085		5,403,463
Derivative financial instruments			488,747		5,614,990
Financial liabilities:
Derivative financial instruments			1,881,450		$ 2,451,422
Recurring basis | Carrying Value
Financial assets:
Available-for-sale securities			4,707,085
Derivative financial instruments			488,747
Financial liabilities:
Derivative financial instruments			1,881,450
Recurring basis | Fair Value
Financial assets:
Available-for-sale securities			4,707,085
Derivative financial instruments			488,747
Financial liabilities:
Derivative financial instruments			1,881,450
Nonrecurring basis | Carrying Value
Financial assets:
Impaired loans, net			101,284,128
Non-financial assets:
Long-lived asset			11,540,664
Nonrecurring basis | Fair Value
Financial assets:
Impaired loans, net			101,284,128
Non-financial assets:
Long-lived asset			11,540,664
Level 1 | Recurring basis
Financial assets:
Available-for-sale securities			264,553
Level 2 | Recurring basis
Financial assets:
Derivative financial instruments			68,989
Financial liabilities:
Derivative financial instruments			1,881,450
Level 3 | Recurring basis
Financial assets:
Available-for-sale securities			4,442,532
Derivative financial instruments			419,758
Level 3 | Nonrecurring basis
Financial assets:
Impaired loans, net			101,284,128
Non-financial assets:
Long-lived asset			$ 11,540,664

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