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FAIR VALUE DISCLOSURES - Summary of Financial Assets and Liabilities Measure at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Assets    
Derivatives $ 13,070 $ 12,559
Investment securities available-for-sale 1,286,770 1,039,870
Liabilities    
Derivatives 13,078 12,587
Fair Value, Measurements, Recurring    
Assets    
Derivatives 13,150 12,922
Investment securities available-for-sale 1,286,770 1,039,870
Total 1,299,920 1,052,792
Liabilities    
Derivatives 13,127 12,725
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1    
Assets    
Derivatives 0 0
Investment securities available-for-sale 2,987 8,711
Total 2,987 8,711
Liabilities    
Derivatives 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2    
Assets    
Derivatives 13,150 12,922
Investment securities available-for-sale 1,283,783 1,031,159
Total 1,296,933 1,044,081
Liabilities    
Derivatives 13,127 12,725
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3    
Assets    
Derivatives 0 0
Investment securities available-for-sale 0 0
Total 0 0
Liabilities    
Derivatives $ 0 $ 0