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FAIR VALUE MEASURES - Summary of Significant Unobservable Inputs Used in Fair Value Measurement of Level 3 Assets and Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Recurring assets at fair value $ 1,011,203 $ 932,973
Nonrecurring assets at fair value 37,018 41,965
Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Recurring assets at fair value 1,500 1,500
Nonrecurring assets at fair value 37,018 41,965
Fair Value, Measurements, Recurring | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Recurring assets at fair value $ 1,500 $ 1,500
Valuation Technique Discounted par values Discounted par values
Unobservable Inputs Credit quality of underlying issuer Credit quality of underlying issuer
Fair value inputs discount rate range 0.00% 0.00%
Fair Value, Measurements, Recurring | Weighted Average | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value inputs discount rate range 0.00% 0.00%
Impaired loans | Fair Value, Measurements, Nonrecurring | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Nonrecurring assets at fair value $ 27,684 $ 28,253
Valuation Technique Third party appraisals and discounted cash flows Third party appraisals and discounted cash flows
Unobservable Inputs Collateral discounts and discount rates Collateral discounts and discount rates
Impaired loans | Fair Value, Measurements, Nonrecurring | Minimum | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value inputs discount rate range 20.00% 15.00%
Impaired loans | Fair Value, Measurements, Nonrecurring | Maximum | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value inputs discount rate range 90.00% 100.00%
Impaired loans | Fair Value, Measurements, Nonrecurring | Weighted Average | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value inputs discount rate range 24.00% 28.00%
Other real estate owned    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Nonrecurring assets at fair value $ 323 $ 1,172
Other real estate owned | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Nonrecurring assets at fair value 323 1,172
Other real estate owned | Fair Value, Measurements, Nonrecurring | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Nonrecurring assets at fair value $ 323 $ 1,172
Valuation Technique Third party appraisals and sales contracts Third party appraisals and sales contracts
Unobservable Inputs Collateral discounts and estimated costs to sell Collateral discounts and estimated costs to sell
Other real estate owned | Fair Value, Measurements, Nonrecurring | Minimum | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value inputs discount rate range 15.00% 15.00%
Other real estate owned | Fair Value, Measurements, Nonrecurring | Maximum | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value inputs discount rate range 15.00% 74.00%
Other real estate owned | Fair Value, Measurements, Nonrecurring | Weighted Average | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value inputs discount rate range 15.00% 22.00%
Purchased other real estate owned    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Nonrecurring assets at fair value $ 9,011 $ 12,540
Purchased other real estate owned | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Nonrecurring assets at fair value 9,011 12,540
Purchased other real estate owned | Fair Value, Measurements, Nonrecurring | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Nonrecurring assets at fair value $ 9,011 $ 12,540
Valuation Technique Third party appraisals Third party appraisals
Unobservable Inputs Collateral discounts and estimated costs to sell Collateral discounts and estimated costs to sell
Purchased other real estate owned | Fair Value, Measurements, Nonrecurring | Minimum | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value inputs discount rate range 10.00% 10.00%
Purchased other real estate owned | Fair Value, Measurements, Nonrecurring | Maximum | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value inputs discount rate range 74.00% 74.00%
Purchased other real estate owned | Fair Value, Measurements, Nonrecurring | Weighted Average | Level 3    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value inputs discount rate range 26.00% 15.00%