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Loans Receivable - Activity Relating to Loans Receivable (Parenthetical) (Detail) (CT CDO I [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 SecurityLoan	Dec. 31, 2013
CT CDO I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan loss reserve	$ 0	$ 10.5
Aggregate principal balance	$ 10.5
Number of loan	1

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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