Leases - Adoption of ASU 2016-02 (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset	$ 2,502
Lease liabilities	2,604
Accrued expenses and other liabilities	$ 19,117		$ 14,786
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset		$ 2,700
Lease liabilities		2,900
Accrued expenses and other liabilities		$ 200