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GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Estimated Annual Amortization Expense) (Details) - Core Deposit Intangibles [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Remainder of 2015 $ 5,253    
2016 6,332    
2017 5,610    
2018 4,889    
2019 4,169    
Thereafter 8,701    
CDI, net $ 34,954 $ 36,762 $ 2,831