INCOME TAXES - Summary of Net Deferred Tax Asset And Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Bad debts	$ 15,634	$ 12,945
Pension and deferred compensation liability	2,006	1,505
Nonaccrual loan interest	892	1,104
Long-term incentive plan	1,212	2,281
Lease liability	1,190	1,303
Other	745	510
Deferred Tax Assets, Gross	21,679	19,648
Deferred tax liabilities:
Depreciation	4,718	4,741
Loan servicing rights	1,162	1,019
State taxes	524	464
Intangible assets	1,265	1,270
REIT spillover dividend	1,180	1,401
Prepaid expenses	948	795
Lease Right of use	1,190	1,303
Other	442	382
Deferred Tax Liabilities, Gross	11,429	11,375
Valuation allowance	0	0
Net deferred tax asset	$ 10,250	$ 8,273