Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Gain (Loss) (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Gain (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
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) $ (1,190) $ 9,249
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) (560) 644
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 0 (82)
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 0 72
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 (4,708) 6,804
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 5,403 (6,804)
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 (10,282) 61,032
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 8,535 (59,786)
Loan | 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) (1,190) 9,249
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) (560) 645
Securities Investment | 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) $ 0 $ (1)