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Fair Values Measurements - Fair Value Option (Details) - Loans held-for-sale - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures    
Fair value carrying amount $ 91,202 $ 18,070
Aggregate unpaid principal amount 88,192 17,517
Fair value carrying amount less aggregate unpaid principal $ 3,010 $ 553