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FAIR VALUE MEASUREMENTS - Non-recurring Fair Value Measurements (Details) - Non-recurring - Level 3 - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, fair value $ 28,638 $ 18,569
Impaired loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, fair value 17,761 11,657
Capitalized servicing rights    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, fair value 10,726 5,187
Other real estate owned    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, fair value $ 151 $ 1,725