Employee Compensation and Benefit Plans Expenses Incurred Under Certain Employee Compensation and Benefit Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Employee Benefits Disclosure [Line Items]
Incentive Compensation Plans	$ 96,892	$ 97,565	$ 78,014
Direct Drive Incentive Compensation Plan	21,174	21,930	20,153
Retention Program	1,475	1,996	1,792
Warrant Incentive Plan	4,954	9,110	3,926
Deferred Compensation Arrangement with Individual, Compensation Expense	1,318	2,404	2,458
SVBFG 401(k) Plan	16,078	13,809	11,996
SVBFG Employee Stock Ownership Plan	$ 3,159	$ 8,585	$ 6,691