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INCOME TAXES, Components of Net Deferred Tax Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Components of net deferred tax liability [Abstract] |  |
Allowance for loan losses | $ 11,675 | $ 18,366
Employee benefits | 4,216 | 6,311
Debt extinguishment | 0 | 299
Other, net | 0 | 5,202
Deferred tax asset | 15,891 | 30,178
Investment securities | 22,690 | 32,839
Tax-deductible goodwill | 39,154 | 43,504
Loan origination costs | 6,109 | 8,228
Depreciation | 2,372 | 71
Mortgage servicing rights | 330 | 548
Pension | 13,228 | 18,194
Other, net | 542 | 0
Deferred tax liability | 84,425 | 103,384
Net deferred tax liability | $ (68,534) | $ (73,206)

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