Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Loan Purchases and Sales (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Loan Purchases and Sales (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     $ 410,624 $ 336,715
Portfolio loans sold or transferred     2,915,318 1,242,039
Commercial and Industrial | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     394,579 316,252
Portfolio loans sold or transferred     1,293,711 380,713
Commercial Real Estate | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     0 0
Portfolio loans sold or transferred     76,965 0
Automobile | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     0 0
Portfolio loans sold or transferred     1,544,642 764,540
Portfolio loans transferred to held-for-sale   $ 1,000,000    
Financing Receivable, Reclassification to Loans and Leases $ 262,000      
Home Equity | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     0 0
Portfolio loans sold or transferred     0 96,786
Residential Mortgage | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     16,045 20,463
Portfolio loans sold or transferred     0 0
RV and marine finance | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     0 0
Portfolio loans sold or transferred     0 0
Other Consumer | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Portfolio loans purchased     0 0
Portfolio loans sold or transferred     $ 0 $ 0