Note FDIC loss share asset (Activity in the FDIC loss share indemnification asset) (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Mar. 31, 2017		Mar. 31, 2016		Dec. 31, 2016
Disclosure Activity In The F D I C Loss Share Indemnification Asset [Abstract]
Balance due to the FDIC for recoveries on covered assets	$ (5,284)	[1]	$ (6,301)	[1]	$ (27,600)

[1] Balance due to the FDIC for recoveries on covered assets for the quarter ended March 31, 2016 amounting to $6.3 million was included in other liablilities in the accompanying consolidated statement of condition (December 31, 2016 - $27.6 million).