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
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) $ 1,548 $ 8,428 $ 9,192
Amount of (gain) or loss reclassified from accumulated OCI into earnings (effective portion) (pre-tax) (360) (220) (3,971)
Deposits | Interest expense deposits      
Derivative Instruments, Gain (Loss) [Line Items]      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges (82) (996) (1,045)
Hedged deposits | Interest expense deposits      
Derivative Instruments, Gain (Loss) [Line Items]      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges 72 992 1,025
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 (47,852) (8,237) 476
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 45,019 8,237 (476)
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 (74,481) 3,903 1,990
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 67,389 (3,602) 828
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) 1,548 8,428 9,192
Amount of (gain) or loss reclassified from accumulated OCI into earnings (effective portion) (pre-tax) (361) (210) (4,064)
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) $ 1 $ (10) $ 93