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Variable Interest Entities (Details)	6 Months Ended
	Jun. 30, 2015 USD ($) item	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Variable Interest Entities
Loans to VIEs	$ 1,595,706,784		$ 1,587,429,498
Loan loss reserves related to VIEs	117,563,544	$ 116,470,000	115,487,320	$ 115,059,988	$ 116,743,412	$ 122,277,411
Non-performing loans
Variable Interest Entities
Loans to VIEs	$ 6,500,000		$ 7,000,000
Unconsolidated VIEs
Variable Interest Entities
Number of VIEs where the reporting entity is not VIE's primary beneficiary | item	24
Carrying Amount	$ 420,733,898
Exposure to real estate debt	1,900,000,000
Loans to VIEs	189,200,000
Loan loss reserves related to VIEs	113,200,000
Unconsolidated VIEs | Non-performing loans
Variable Interest Entities
Loans to VIEs	40,300,000
Unconsolidated VIEs | Maximum
Variable Interest Entities
Exposure to loss	420,733,898
Unconsolidated VIEs | Loans
Variable Interest Entities
Carrying Amount	390,116,524
Unconsolidated VIEs | Loans | Maximum
Variable Interest Entities
Exposure to loss	390,116,524
Unconsolidated VIEs | Loans and equity investments
Variable Interest Entities
Carrying Amount	30,039,374
Unconsolidated VIEs | Loans and equity investments | Maximum
Variable Interest Entities
Exposure to loss	30,039,374
Unconsolidated VIEs | Junior subordinated notes
Variable Interest Entities
Carrying Amount	578,000
Unconsolidated VIEs | Junior subordinated notes | Maximum
Variable Interest Entities
Exposure to loss	$ 578,000

X

- Definition

Represents the exposure to loss on investments that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE).

+ References

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- Definition

Represents the number of variable interest entities (VIEs) in which the entity is not a primary beneficiary.

+ References

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- Definition

Carrying amount of the total liabilities that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE).

+ References

No definition available.

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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



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-Name Accounting Standards Codification



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-SubTopic 10



-Section 50



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The carrying amount of the outstanding balance due under the mortgage loan.

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-Topic 205



-SubTopic 10



-Section S99



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Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

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