Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - TDRs (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - TDRs (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
contract
Dec. 31, 2015
USD ($)
contract
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 5,053 6,191
Post-modification Outstanding Balance (2) $ 677,714,000 $ 894,700,000
Financial effects of modification $ (11,638,000) $ 14,533,000
Commercial | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts 4 13
Post-modification Outstanding Balance (2) $ 161,000 $ 8,243,000
Financial effects of modification 5,000 $ (1,042,000)
Commercial | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract   765
Post-modification Outstanding Balance (2) 490,488,000 $ 524,356,000
Financial effects of modification $ (8,751,000) $ 5,853,000
Commercial | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 20 16
Post-modification Outstanding Balance (2) $ 1,951,000 $ 29,842,000
Financial effects of modification $ (14,000) $ 449,000
Commercial | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 896 794
Post-modification Outstanding Balance (2) $ 492,600,000 $ 562,441,000
Financial effects of modification $ (8,760,000) $ 7,344,000
Commercial | Commercial and Industrial | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 872  
Commercial | Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 117 158
Post-modification Outstanding Balance (2) $ 69,730,000 $ 143,967,000
Financial effects of modification $ (1,852,000) $ 1,283,000
Commercial | Commercial Real Estate | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 2 4
Post-modification Outstanding Balance (2) $ 223,000 $ 2,249,000
Financial effects of modification $ 0 $ 4,000
Commercial | Commercial Real Estate | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 111 143
Post-modification Outstanding Balance (2) $ 69,192,000 $ 141,238,000
Financial effects of modification $ (1,868,000) $ 1,249,000
Commercial | Commercial Real Estate | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 4 11
Post-modification Outstanding Balance (2) $ 315,000 $ 480,000
Financial effects of modification $ 16,000 $ (30,000)
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 2,669 2,558
Post-modification Outstanding Balance (2) $ 23,172,000 $ 19,779,000
Financial effects of modification $ (1,477,000) $ (961,000)
Consumer | Automobile | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 17 41
Post-modification Outstanding Balance (2) $ 212,000 $ 121,000
Financial effects of modification $ (12,000) $ (5,000)
Consumer | Automobile | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 1,593 1,591
Post-modification Outstanding Balance (2) $ 14,542,000 $ 12,268,000
Financial effects of modification $ (1,065,000) $ (533,000)
Consumer | Automobile | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 1,059 926
Post-modification Outstanding Balance (2) $ 8,418,000 $ 7,390,000
Financial effects of modification $ (400,000) $ (423,000)
Consumer | Automobile | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 0 0
Post-modification Outstanding Balance (2) $ 0 $ 0
Financial effects of modification $ 0 $ 0
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 915 1,976
Post-modification Outstanding Balance (2) $ 44,969,000 $ 93,277,000
Financial effects of modification $ (780,000) $ (6,207,000)
Consumer | Home Equity | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 55 55
Post-modification Outstanding Balance (2) $ 2,928,000 $ 4,399,000
Financial effects of modification $ (110,000) $ (161,000)
Consumer | Home Equity | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 578 1,591
Post-modification Outstanding Balance (2) $ 32,006,000 $ 79,023,000
Financial effects of modification $ (3,709,000) $ (10,639,000)
Consumer | Home Equity | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 282 330
Post-modification Outstanding Balance (2) $ 10,035,000 $ 9,855,000
Financial effects of modification $ (2,819,000) $ (4,271,000)
Consumer | Home Equity | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 0 0
Post-modification Outstanding Balance (2) $ 0 $ 0
Financial effects of modification $ 0 $ 0
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 442 683
Post-modification Outstanding Balance (2) $ 46,596,000 $ 74,873,000
Financial effects of modification $ (1,754,000) $ (680,000)
Consumer | Residential Mortgage | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 13 15
Post-modification Outstanding Balance (2) $ 1,287,000 $ 1,565,000
Financial effects of modification $ (18,000) $ (61,000)
Consumer | Residential Mortgage | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 363 518
Post-modification Outstanding Balance (2) $ 39,170,000 $ 57,859,000
Financial effects of modification $ (1,650,000) $ (455,000)
Consumer | Residential Mortgage | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 62 139
Post-modification Outstanding Balance (2) $ 5,715,000 $ 14,183,000
Financial effects of modification $ 86,000 $ 164,000
Consumer | Residential Mortgage | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 4 11
Post-modification Outstanding Balance (2) $ 424,000 $ 1,266,000
Financial effects of modification $ 0 $ 0
Consumer | RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 0 0
Post-modification Outstanding Balance (2) $ 0 $ 0
Financial effects of modification $ 0 $ 0
Consumer | RV and marine finance | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 0 0
Post-modification Outstanding Balance (2) $ 0 $ 0
Financial effects of modification $ 0 $ 0
Consumer | RV and marine finance | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 0 0
Post-modification Outstanding Balance (2) $ 0 $ 0
Financial effects of modification $ 0 $ 0
Consumer | RV and marine finance | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 0 0
Post-modification Outstanding Balance (2) $ 0 $ 0
Financial effects of modification $ 0 $ 0
Consumer | RV and marine finance | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 0 0
Post-modification Outstanding Balance (2) $ 0 $ 0
Financial effects of modification $ 0 $ 0
Consumer | Other Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 14 22
Post-modification Outstanding Balance (2) $ 647,000 $ 363,000
Financial effects of modification $ (31,000) $ (20,000)
Consumer | Other Consumer | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 0 1
Post-modification Outstanding Balance (2) $ 0 $ 96,000
Financial effects of modification $ 0 $ (3,000)
Consumer | Other Consumer | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 6 10
Post-modification Outstanding Balance (2) $ 575,000 $ 198,000
Financial effects of modification $ (24,000) $ (8,000)
Consumer | Other Consumer | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 8 11
Post-modification Outstanding Balance (2) $ 72,000 $ 69,000
Financial effects of modification $ (7,000) $ (9,000)
Consumer | Other Consumer | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 0 0
Post-modification Outstanding Balance (2) $ 0 $ 0
Financial effects of modification $ 0 $ 0