Subsequent Events (Details) $ in Thousands, shares in Millions		3 Months Ended
	Jul. 31, 2017 USD ($) shares	Mar. 07, 2017 offering	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)
Subsequent Event [Line Items]
Total Assets			$ 21,790,727	$ 21,659,190	$ 20,160,855
Total deposits			16,853,116	$ 17,408,283	$ 15,862,027
Sabadell United
Subsequent Event [Line Items]
Number of public stock offerings used to finance | offering		2
Total Assets			5,700,000
Gross loans			4,100,000
Total deposits			$ 4,400,000
Subsequent Event
Subsequent Event [Line Items]
Total Assets	$ 28,000,000
Subsequent Event | Sabadell United
Subsequent Event [Line Items]
Cash payment	$ 796,000
Number of shares paid | shares	2.6
Total consideration	$ 1,000,000