Fair Value Measurements (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Fair value measurements
Fair value carrying amount		$ 9,210	$ 11,290
Mortgages held for sale reported at fair value
Fair value measurements
Fair value carrying amount		9,210	11,290
Aggregate unpaid principal		8,970	11,076
Excess of fair value carrying amount over (under) unpaid principal	[1]	$ 240	$ 214

[1] The excess of fair value carrying amount over (under) unpaid principal is included in mortgage banking income and includes changes in fair value at and subsequent to funding and gains and losses on the related loan commitment prior to funding.