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FAIR VALUE OF ASSETS AND LIABILITIES (Assets Measured on a Nonrecurring Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets measured at fair value on a nonrecurring basis    
Other real estate owned $ 851 $ 791
Total Losses    
Mortgage servicing rights 15,843 15,779
Nonrecurring basis    
Total Losses    
Impaired loans 0 0
Other real estate 0 0
Total Losses 0 0
Mortgage servicing rights 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Total Losses    
Mortgage servicing rights 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Nonrecurring basis    
Assets measured at fair value on a nonrecurring basis    
Impaired loans 0 0
Other real estate owned 0 0
Total Losses    
Mortgage servicing rights 0 0
Significant Other Observable Inputs (Level 2)    
Total Losses    
Mortgage servicing rights 0 0
Significant Other Observable Inputs (Level 2) | Nonrecurring basis    
Assets measured at fair value on a nonrecurring basis    
Impaired loans 21,280 30,723
Other real estate owned 851 791
Total Losses    
Mortgage servicing rights 0 0
Significant Unobservable Inputs (Level 3) | Nonrecurring basis    
Assets measured at fair value on a nonrecurring basis    
Impaired loans 0 0
Other real estate owned 0 0
Total Losses    
Mortgage servicing rights 17,161 18,087
Estimated Fair Value    
Total Losses    
Mortgage servicing rights 17,161 18,087
Estimated Fair Value | Nonrecurring basis    
Assets measured at fair value on a nonrecurring basis    
Impaired loans $ 21,280 $ 30,723