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FAIR VALUE MEASUREMENTS - Marketable Securities/Loans Held for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Loans Held for Sale    
Fair Value $ 59,261 $ 45,185
Amortized Cost 59,261 36,483
Gains 0 9,211
Level 1    
Loans Held for Sale    
Fair Value 59,261 45,185
Amortized Cost 55,719 36,483
Gains 3,542 8,702
Aggregate Fair Value 0 0
Aggregate Unpaid Principal 0 0
Level 2    
Loans Held for Sale    
Aggregate Fair Value 98,440 153,620
Aggregate Unpaid Principal 1,392 1,392
Recurring | Level 1    
Loans Held for Sale    
Aggregate Fair Value 0 0
Recurring | Level 2    
Loans Held for Sale    
Aggregate Fair Value 98,440 153,620
Recurring | Loans Held for Sale | Level 2    
Loans Held for Sale    
Aggregate Fair Value 98,440 153,620
Aggregate Unpaid Principal 96,300 149,022
Aggregate Fair Value Less Aggregate Unpaid Principal $ 2,140 $ 4,598