Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Cash Flow Hedges (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Cash Flow Hedges (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash Flow Hedging    
Gains and (losses) recognized in other comprehensive income (loss) (OCI) for derivatives designated as effective cash flow hedges    
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) $ 9,249 $ 18,294
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 644 123
Hedged Other long term debt | Interest expense subordinated notes and other long term debt    
Increase or (decrease) to interest expense for derivatives designated as fair value hedges    
Increase or (decrease) to interest expense for derivatives designated as fair value hedges (59,786) (19,645)
Hedged Subordinated notes | Interest expense subordinated notes and other long term debt    
Increase or (decrease) to interest expense for derivatives designated as fair value hedges    
Increase or (decrease) to interest expense for derivatives designated as fair value hedges (6,804) (3,231)
Hedged Deposits | Interest expense deposits    
Increase or (decrease) to interest expense for derivatives designated as fair value hedges    
Increase or (decrease) to interest expense for derivatives designated as fair value hedges 72 214
Loans | Interest and fee income loans and leases | Cash Flow Hedging    
Gains and (losses) recognized in other comprehensive income (loss) (OCI) for derivatives designated as effective cash flow hedges    
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) 9,249 18,294
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 645 133
Investment securities | Interest and fee income investment securities | Cash Flow Hedging    
Gains and (losses) recognized in other comprehensive income (loss) (OCI) for derivatives designated as effective cash flow hedges    
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) 0 0
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) (1) (10)
Deposits | Interest expense deposits    
Increase or (decrease) to interest expense for derivatives designated as fair value hedges    
Increase or (decrease) to interest expense for derivatives designated as fair value hedges (82) (213)
Subordinated notes | Interest expense subordinated notes and other long term debt    
Increase or (decrease) to interest expense for derivatives designated as fair value hedges    
Increase or (decrease) to interest expense for derivatives designated as fair value hedges 6,804 3,231
Other long-term debt | Interest expense subordinated notes and other long term debt    
Increase or (decrease) to interest expense for derivatives designated as fair value hedges    
Increase or (decrease) to interest expense for derivatives designated as fair value hedges $ 61,032 $ 20,025