Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Cash Flow Hedges) (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Cash Flow Hedges) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain or (loss) recognized in OCI on derivatives (effective portion)   $ 8,428 $ 9,192 $ (56,056)
Amount of (gain) or loss reclassified from accumulated OCI into earnings (effective portion) (pre-tax)   (220) (3,971) (15,188)
Deposits | Interest expense deposits        
Derivative Instruments, Gain (Loss) [Line Items]        
Increase or (decrease) to interest expense for derivatives designated as fair value hedges   (996) (1,045) (4,006)
Hedged deposits | Interest expense deposits        
Derivative Instruments, Gain (Loss) [Line Items]        
Increase or (decrease) to interest expense for derivatives designated as fair value hedges   992 1,025 4,003
Subordinated notes | Interest expense subordinated notes and other long term debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Increase or (decrease) to interest expense for derivatives designated as fair value hedges   (8,237) 476 (44,699)
Hedged subordinated notes | Interest expense subordinated notes and other long term debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Increase or (decrease) to interest expense for derivatives designated as fair value hedges   8,237 (476) 44,699
Other long-term debt | Interest expense subordinated notes and other long term debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Increase or (decrease) to interest expense for derivatives designated as fair value hedges   3,903 1,990 (5,716)
Hedged Other long term debt | Interest expense subordinated notes and other long term debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Increase or (decrease) to interest expense for derivatives designated as fair value hedges   (3,602) $ 828 6,843
Loans | Interest and fee income—loans and leases | Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) $ 9,192 8,428   (56,056)
Amount of (gain) or loss reclassified from accumulated OCI into earnings (effective portion) (pre-tax) (4,064) (210)   (14,979)
Loans | Noninterest income - other income | Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) 0 0   0
Amount of (gain) or loss reclassified from accumulated OCI into earnings (effective portion) (pre-tax) $ 93 $ (10)   $ (209)