Note Transfers of financial assets and servicing rights (Changes in MSRs measured using the fair value method) (Detail) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Transfers and Servicing of Financial Assets
Fair value at beginning of period		$ 196,889	$ 211,405
Additions		5,839	4,989
Changes due to payments of loans	[1]	(9,276)	(8,850)
Reduction due to loan repurchases		(1,102)	(734)
Changes in fair value due to changes in valuation model inputs or assumptions		(3,622)	(3,233)
Fair value at end of period		$ 188,728	$ 203,577

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