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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Assets and Liabilities Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets measured at fair value on a nonrecurring basis    
Mortgage servicing rights $ 15,821 $ 15,843
Other real estate owned 595 851
Nonrecurring basis    
Assets measured at fair value on a nonrecurring basis    
Impaired loans 20,963 21,280
Mortgage servicing rights 18,463 17,161
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets measured at fair value on a nonrecurring basis    
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
Mortgage servicing rights 0 0
Other real estate owned 0 0
Significant Other Observable Inputs (Level 2)    
Assets measured at fair value on a nonrecurring basis    
Mortgage servicing rights 0 0
Significant Other Observable Inputs (Level 2) | Nonrecurring basis    
Assets measured at fair value on a nonrecurring basis    
Impaired loans 20,963 21,280
Mortgage servicing rights 0 0
Other real estate owned 595 851
Significant Unobservable Inputs (Level 3)    
Assets measured at fair value on a nonrecurring basis    
Mortgage servicing rights   17,161
Significant Unobservable Inputs (Level 3) | Nonrecurring basis    
Assets measured at fair value on a nonrecurring basis    
Impaired loans 0 0
Mortgage servicing rights 18,463 17,161
Other real estate owned $ 0 $ 0