Note Non-consolidated VIEs (Carrying amount and classification of assets related to the Corporation's VI in non-consolidated VIEs, PRLP 2011 Holdings, LLC and max exposure to loss) (Detail) - PRLP 2011 Holding, LLC - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Assets	$ 9,076	$ 14,059
Liabilities	(2,806)	(18,808)
Net assets	6,270	(4,749)
Maximum exposure to loss	6,270	0
Loan
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Assets	0	980
Advances Working Capital Line
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Assets	0	579
Advances Advance Facility
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Assets	0	401
Accrued Income Receivable
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Assets	0	10
Equity Method Investments
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Assets	9,076	13,069
Deposits
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Liabilities	$ (2,806)	$ (18,808)