Annual report pursuant to Section 13 and 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option-Changes in Fair Value (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option-Changes in Fair Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans held for sale      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Net gains (losses) from fair value changes $ 6,741 $ (2,342) $ (1,978)
Loans held for investment      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Net gains (losses) from fair value changes 0 (568) (918)
Gains (losses) included in fair value changes associated with instrument specific credit risk $ 436 $ 199 $ 911