Deposits - Schedule of Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Deposits [Abstract]
Non-interest bearing demand deposits	$ 1,175,222	$ 760,887
Interest bearing checking accounts	317,145	186,611
Money market demand accounts	661,271	349,862
Other savings	476,879	437,212
Time deposits (below $250,000)	916,014	627,255
Time deposits ($250,000 and above)	194,236	81,502
Total deposits	$ 3,740,767	$ 2,443,329