Deposits - Certificates of Deposits Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Time Deposits, Fiscal Year Maturity [Abstract]
One year or less	$ 2,667,980	$ 1,717,891
After one year to two years	1,210,429	1,038,778
After two years to three years	1,053,442	948,490
After three years to four years	630,851	846,976
After four years to five years	203,704	577,827
After five years	165,047	178,856
Total	$ 5,931,453	$ 5,308,818