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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2014
Derivative [Line Items]            
Acquisition, restructuring and other expenses     $ 8,317 $ 1,728 $ 3,302  
Fixed rate of interest rate swap     580,372 182,239    
Interest rate caps agreements            
Derivative [Line Items]            
Premiums paid           $ 4,600
Cap interest rate           3.00%
Effective interest rate           3.00%
Acquisition, restructuring and other expenses     3,200      
Customer Loan Derivatives            
Derivative [Line Items]            
Cash posted with counterparty     10,700      
Designated as Hedging Instrument | Cash Flow Hedges            
Derivative [Line Items]            
Fixed rate of interest rate swap     100,000 $ 90,000    
Designated as Hedging Instrument | Cash Flow Hedges | Interest rate swap on deposits            
Derivative [Line Items]            
Term of interest rate swap 5 years 5 years        
Fixed rate of interest rate swap $ 50,000 $ 50,000        
Notional amount of interest rate swap 1.55% 2.461%        
Designated as Hedging Instrument | Fair Value Hedging            
Derivative [Line Items]            
Fixed rate of interest rate swap     37,190      
Designated as Hedging Instrument | Fair Value Hedging | Interest rate swap on deposits            
Derivative [Line Items]            
Fixed rate of interest rate swap     $ 37,200      
Fixed interest rate, weighted average     1.696%