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Fair Value Measurements - Changes in Level 3 Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis    
Balance, beginning of period $ 71,013 $ 63,841
Gains (losses): Recorded in earnings (realized):    
Recorded in Net gain on sale of loans and other mortgage banking revenue (8,445) 3,029
New originations 2,133 1,967
Balance, end of period $ 64,701 $ 68,837