Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, unpaid principle $ 0 $ 0
Impaired loans and leases with no related allowance, average balance 0 0
Impaired loans and leases with no related allowance, interest income recognized 0 0
Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, unpaid principle 0 0
Impaired loans and leases with no related allowance, average balance 0 0
Impaired loans and leases with no related allowance, interest income recognized 0 0
Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, unpaid principle 0 0
Impaired loans and leases with no related allowance, average balance 0 0
Impaired loans and leases with no related allowance, interest income recognized 0 0
RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, unpaid principle 0 0
Impaired loans and leases with no related allowance, average balance 0 0
Impaired loans and leases with no related allowance, interest income recognized 0 0
Commercial | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 299,606 255,801
Impaired loans and leases with no related allowance, unpaid principle 358,712 279,551
Impaired loans and leases with no related allowance, average balance 292,567 114,389
Impaired loans and leases with no related allowance, interest income recognized 9,401 2,584
Impaired loans and leases with an allowance recorded, ending balance 406,243 246,249
Impaired loans and leases with an allowance recorded, unpaid principle 448,121 274,203
Impaired loans and leases with an allowance recorded, related allowance 22,259 21,916
Impaired Financing Receivable, Average Recorded Investment 594,165 382,051
Impaired loans and leases with an allowance recorded, average balance 301,598 267,662
Impaired loans and leases with an allowance recorded, interest income recognized 8,124 15,110
Considered impaired due to TDR status 293,000 91,000
Impaired Financing Receivable, Recorded Investment 705,849 502,050
Impaired Financing Receivable, Unpaid Principal Balance 806,833 553,754
Impaired Financing Receivable, Interest Income, Accrual Method 17,525 17,694
Commercial | Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 88,817 68,260
Impaired loans and leases with no related allowance, unpaid principle 126,152 125,814
Impaired loans and leases with no related allowance, average balance 73,040 88,173
Impaired loans and leases with no related allowance, interest income recognized 4,191 7,199
Impaired loans and leases with an allowance recorded, ending balance 97,238 90,475
Impaired loans and leases with an allowance recorded, unpaid principle 107,512 104,930
Impaired loans and leases with an allowance recorded, related allowance 3,434 8,114
Impaired Financing Receivable, Average Recorded Investment 141,905 202,192
Impaired loans and leases with an allowance recorded, average balance 68,865 114,019
Impaired loans and leases with an allowance recorded, interest income recognized 2,978 4,833
Considered impaired due to TDR status 81,000 35,000
Impaired Financing Receivable, Recorded Investment 186,055 158,735
Impaired Financing Receivable, Unpaid Principal Balance 233,664 230,744
Impaired Financing Receivable, Interest Income, Accrual Method 7,169 12,032
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 0 0
Impaired loans and leases with an allowance recorded, ending balance 30,961 31,304
Impaired loans and leases with an allowance recorded, unpaid principle 31,298 31,878
Impaired loans and leases with an allowance recorded, related allowance 1,850 1,779
Impaired Financing Receivable, Average Recorded Investment 31,722 30,163
Impaired loans and leases with an allowance recorded, average balance 31,722 30,163
Impaired loans and leases with an allowance recorded, interest income recognized 2,162 2,224
Impaired Financing Receivable, Recorded Investment 30,961 31,304
Impaired Financing Receivable, Unpaid Principal Balance 31,298 31,878
Impaired Financing Receivable, Interest Income, Accrual Method 2,162 2,224
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 0 0
Impaired loans and leases with an allowance recorded, ending balance 319,404 248,839
Impaired loans and leases with an allowance recorded, unpaid principle 352,722 284,957
Impaired loans and leases with an allowance recorded, related allowance 15,032 16,242
Impaired Financing Receivable, Average Recorded Investment 277,692 292,014
Impaired loans and leases with an allowance recorded, average balance 277,692 292,014
Impaired loans and leases with an allowance recorded, interest income recognized 13,410 13,092
Impaired Financing Receivable, Recorded Investment 319,404 248,839
Impaired Financing Receivable, Unpaid Principal Balance 352,722 284,957
Impaired Financing Receivable, Interest Income, Accrual Method 13,410 13,092
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 0 0
Impaired loans and leases with an allowance recorded, ending balance 327,753 368,449
Impaired loans and leases with an allowance recorded, unpaid principle 363,099 411,114
Impaired loans and leases with an allowance recorded, related allowance 12,849 16,938
Impaired Financing Receivable, Average Recorded Investment 348,158 373,573
Impaired loans and leases with an allowance recorded, average balance 348,158 373,573
Impaired loans and leases with an allowance recorded, interest income recognized 11,945 12,889
TDR government guarantee 29,000 29,000
Impaired Financing Receivable, Recorded Investment 327,753 368,449
Impaired Financing Receivable, Unpaid Principal Balance 363,099 411,114
Impaired Financing Receivable, Interest Income, Accrual Method 11,945 12,889
Consumer | RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 0 0
Impaired loans and leases with an allowance recorded, ending balance 0 0
Impaired loans and leases with an allowance recorded, unpaid principle 0 0
Impaired loans and leases with an allowance recorded, related allowance 0 0
Impaired Financing Receivable, Average Recorded Investment 0 0
Impaired loans and leases with an allowance recorded, average balance 0 0
Impaired loans and leases with an allowance recorded, interest income recognized 0 0
Impaired Financing Receivable, Recorded Investment 0 0
Impaired Financing Receivable, Unpaid Principal Balance 0 0
Impaired Financing Receivable, Interest Income, Accrual Method 0 0
Consumer | Other Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 0 52
Impaired loans and leases with no related allowance, unpaid principle 0 101
Impaired loans and leases with no related allowance, average balance 0 51
Impaired loans and leases with no related allowance, interest income recognized 0 17
Impaired loans and leases with an allowance recorded, ending balance 3,897 4,640
Impaired loans and leases with an allowance recorded, unpaid principle 3,897 4,649
Impaired loans and leases with an allowance recorded, related allowance 260 176
Impaired Financing Receivable, Average Recorded Investment 4,481 4,726
Impaired loans and leases with an allowance recorded, average balance 4,481 4,675
Impaired loans and leases with an allowance recorded, interest income recognized 233 254
Impaired Financing Receivable, Recorded Investment 3,897 4,692
Impaired Financing Receivable, Unpaid Principal Balance 3,897 4,750
Impaired Financing Receivable, Interest Income, Accrual Method $ 233 $ 271