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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commercial real estate loans held for sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans in this portfolio that were 90 days or more past due or nonaccruing   $ 0    
Other noninterest income   4,000,000 $ 3,000,000 $ 1,000,000
Recurring basis | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Transfers from Level 3 to Level 2 $ 5,000,000 0 5,000,000 0
Mortgage banking fees | Residential loans held for sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Changes in fair value for loans accounted for under fair value option   $ (5,000,000) $ (2,000,000) $ 5,000,000