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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair value measurements    
Fair value carrying amount $ 11,290 $ 13,123
Mortgages held for sale reported at fair value    
Fair value measurements    
Fair value carrying amount 11,290 13,123
Aggregate unpaid principal 11,076 12,967
Excess of fair value carrying amount over (under) unpaid principal [1] $ 214 $ 156
[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.