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INCOME TAXES, Components of Net Deferred Tax Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Components of net deferred tax liability [Abstract] |  |
Allowance for loan losses | $ 18,366 | $ 17,791
Employee benefits | 6,311 | 6,633
Debt extinguishment | 299 | 613
Other, net | 5,202 | 9,704
Deferred tax asset | 30,178 | 34,741
Investment securities | 32,839 | 38,314
Tax-deductible goodwill | 43,504 | 39,724
Loan origination costs | 8,228 | 7,295
Depreciation | 71 | 886
Mortgage servicing rights | 548 | 565
Pension | 18,194 | 14,807
Deferred tax liability | 103,384 | 101,591
Net deferred tax liability | $ (73,206) | $ (66,850)

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