Fair Value Measurements (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Fair value measurements
Fair value carrying amount		$ 12,885	$ 20,277
Mortgages held for sale reported at fair value
Fair value measurements
Fair value carrying amount		12,885	20,277
Aggregate unpaid principal		11,045	19,890
Excess of fair value carrying amount over (under) unpaid principal	[1]	$ 1,840	$ 387

[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.