INCOME TAXES, Components of Net Deferred Tax Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Components of net deferred tax liability [Abstract]
Allowance for loan losses	$ 12,131	$ 11,675
Employee benefits	4,479	4,216
Other, net	541	0
Deferred tax asset	17,151	15,891
Investment securities	14,451	22,690
Tax-deductible goodwill	39,540	39,154
Loan origination costs	6,851	6,109
Depreciation	3,098	2,372
Mortgage servicing rights	277	330
Pension	11,078	13,228
Other, net	0	542
Deferred tax liability	75,295	84,425
Net deferred tax liability	$ (58,144)	$ (68,534)