INCOME TAXES - Summary of Net Deferred Tax Asset And Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Bad debts	$ 12,945	$ 12,478
Pension and deferred compensation liability	1,505	1,188
Nonaccrual loan interest	1,104	937
Long-term incentive plan	2,281	2,357
Lease liability	1,303	0
Other	510	506
Deferred Tax Assets, Gross	19,648	17,466
Deferred tax liabilities:
Depreciation	4,741	4,583
Loan servicing rights	1,019	877
State taxes	464	447
Intangible assets	1,270	1,280
REIT spillover dividend	1,401	1,231
Prepaid expenses	795	786
Lease Right of use	1,303	0
Other	382	475
Deferred Tax Liabilities, Gross	11,375	9,679
Valuation allowance	0	0
Net deferred tax asset	$ 8,273	$ 7,787