Note Transfers of financial assets and servicing rights (Changes in MSRs measured using the fair value method) (Detail) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Transfers and Servicing of Financial Assets
Fair value at beginning of period		$ 196,889	$ 211,405
Additions		7,530	7,843
Changes due to payments of loans	[1]	(12,794)	(13,381)
Reduction due to loan repurchases		(1,605)	(1,183)
Changes in fair value due to changes in valuation model inputs or assumptions		(9,863)	(4,315)
Other disposals		0	(15)
Fair value at end of period		$ 180,157	$ 200,354

[1] Represents the change due to collection / realization of expected cash flow over time.