Note Non-consolidated VIEs (Carrying amount and classification of assets related to the Corporation's VI in non-consolidated VIEs, PR Asset Portfolio 2013-1 International, LLC and PRLP 2011 Holdings, LLC and max exposure to loss) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
PR Asset Portfolio 2013-1 International, LLC
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Assets	$ 4,749	$ 5,794
Liabilities	(10,497)	(7,994)
Total net assets	(5,748)	(2,200)
Maximum exposure to loss	0	0
PRLP 2011 Holding, LLC
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Assets	6,349	6,469
Liabilities	(1,258)	(2,566)
Total net assets	5,091	3,903
Maximum exposure to loss	5,091	3,903
Equity Method Investments | PR Asset Portfolio 2013-1 International, LLC
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Assets	4,749	5,794
Equity Method Investments | PRLP 2011 Holding, LLC
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Assets	6,349	6,469
Deposits | PR Asset Portfolio 2013-1 International, LLC
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Liabilities	(10,497)	(7,994)
Deposits | PRLP 2011 Holding, LLC
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Liabilities	$ (1,258)	$ (2,566)