Loans and Allowance for Loan Losses Recorded Investment in Loans Modified in TDRs within Previous 12 months Subsequently Defaulted (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment subsequently defaulted	$ 1,980	$ 27,525	$ 1,980	$ 27,525
Commercial Portfolio Segment | Software and internet
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment subsequently defaulted	1,474	27,525	1,474	27,525
Commercial Portfolio Segment | Premium wine
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment subsequently defaulted	$ 506	$ 0	$ 506	$ 0