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Summary of Significant Accounting Policies (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) Segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Accounting Policies [Abstract]
Number of business segments | Segment									1
Summary Of Significant Accounting Policies [Line Items]
Provision for loan losses	$ 0	$ 0	$ 15,000,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 15,000,000	$ 0	$ 0
Capitalized financing costs	6,763,000				7,353,000				6,763,000	7,353,000
Operating loss carryforward	1,400,000								1,400,000
Accounting Standards Update 2015-03 [Member] | Borrowings under Agreements to Repurchase [Member]
Summary Of Significant Accounting Policies [Line Items]
Capitalized financing costs	$ 6,763,000				7,353,000				6,763,000	7,353,000
Commercial Mortgage Portfolio Segment [Member]
Summary Of Significant Accounting Policies [Line Items]
Provision for loan losses									10,000,000	0
Loan receivable, allowance					$ 0					0
Subordinate Mortgage Portfolio Segment [Member]
Summary Of Significant Accounting Policies [Line Items]
Provision for loan losses									$ 5,000,000	$ 0

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of expense related to estimated loss from loan and lease transactions.

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