Note Transfers of financial assets and servicing rights (Changes in MSRs measured using the fair value method) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Transfers and Servicing of Financial Assets
Fair value at beginning of period	$ 196,889		$ 211,405
Additions	2,763		2,123
Changes due to payments of loans	(4,587)	[1]	(4,254)
Reduction due to loan repurchases	(644)		(357)
Changes in fair value due to changes in valuation model inputs or assumptions	(723)		(3,866)
Fair value at end of period	$ 193,698		$ 205,051

[1] Represents changes due to collection / realization of expected cash flows over time.