Leases - Summary of Initial Recognition of Operating Lease Assets and Liability (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Operating Leased Assets [Line Items]
Total operating right-of-use assets	$ 67,600
Operating lease liability	$ 79,749
ASU 2016-02
Operating Leased Assets [Line Items]
Operating right-of-use assets		$ 65,902
State Bank acquisition		14,089
Total operating right-of-use assets		79,991
Operating lease liability		$ 92,268