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Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Gains and Losses from Changes in Fair Value of Loans Held for Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]    
Interest income $ 333 $ 259
Change in fair value (59) 78
Total change in fair value $ 274 $ 337