Operating Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Right of use assets, included in Other assets	$ 17,527	$ 14,499
Operating lease liabilities, included in Other liabilities	$ 18,439	$ 13,908
Weighted average remaining lease term	4 years 8 months 26 days
Weighted average discount rate	3.78%