Fair Value Measurements (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Fair value measurements
Fair value carrying amount		$ 19,986	$ 9,825
Mortgages held for sale reported at fair value
Fair value measurements
Fair value carrying amount		19,986	9,825
Aggregate unpaid principal		19,605	9,691
Excess of fair value carrying amount over (under) unpaid principal	[1]	$ 381	$ 134

[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.