Other Borrowings - Schedule of Company's Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Overnight FHLB advances	$ 647,075	$ 587,742
Term FHLB advances	425,000	475,000
Other	4,000	9,000
Total other borrowings	$ 1,076,075	$ 1,071,742