FAIR VALUE DISCLOSURES - Fair market values of all financial instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financial assets:
Interest bearing deposits in banks	$ 266,944	$ 329,103
Time deposits in other banks	600	600
Securities available for sale	223,175	205,944
Other securities	223,208	205,978
Securities held to maturity	33	34
Other investments	12,226	12,063
Loans, including held for sale, net	1,460	613
Accrued interest receivable	6,100	5,500
Financial liabilities:
Noninterest-bearing deposits	1,109,789	1,025,425
Interest-bearing deposits	1,493,183	1,515,335
Repurchase agreements	1,525	2,343
Junior subordinated debt	$ 6,726	$ 6,726
Minimum
Loans
Discount rates for loans	2.30%	2.30%
Maximum
Loans
Discount rates for loans	16.50%	16.50%
Total Fair Value
Financial assets:
Cash and due from banks	$ 59,255	$ 53,000
Interest bearing deposits in banks	266,944	329,103
Time deposits in other banks	600	600
Securities available for sale	222,088	204,880
Other securities	1,087	1,064
Securities held to maturity	35	37
Other investments	12,226	12,063
Loans, including held for sale, net	2,299,742	2,139,645
Bank-owned life insurance	68,010	51,430
Servicing asset	209	186
Accrued interest receivable	7,429	6,674
Total financial assets	2,938,391	2,799,462
Financial liabilities:
Noninterest-bearing deposits	1,109,789	1,025,425
Interest-bearing deposits	1,437,013	1,451,512
Repurchase agreements	1,525	2,342
Junior subordinated debt	6,726	6,726
Note payable		27,679
Accrued interest payable	374	582
Total financial liabilities	2,556,193	2,515,046
Carrying Amount
Financial assets:
Cash and due from banks	59,255	53,000
Interest bearing deposits in banks	266,944	329,103
Time deposits in other banks	600	600
Securities available for sale	222,088	204,880
Other securities	1,087	1,064
Securities held to maturity	33	34
Other investments	12,226	12,063
Loans, including held for sale, net	2,288,226	2,130,492
Bank-owned life insurance	68,010	51,430
Servicing asset	209	186
Accrued interest receivable	7,429	6,674
Total financial assets	2,926,873	2,790,306
Financial liabilities:
Noninterest-bearing deposits	1,109,789	1,025,425
Interest-bearing deposits	1,493,183	1,515,335
Repurchase agreements	1,525	2,343
Junior subordinated debt	6,726	6,726
Note payable		27,679
Accrued interest payable	374	582
Total financial liabilities	2,612,363	2,578,870
Interest rate swaps with customers | Total Fair Value
Financial assets:
Interest rate swaps assets	340	430
Financial liabilities:
Interest rate swaps liabilities	426	350
Interest rate swaps with customers | Carrying Amount
Financial assets:
Interest rate swaps assets	340	430
Financial liabilities:
Interest rate swaps liabilities	426	350
Interest rate swaps with financial institutions | Total Fair Value
Financial assets:
Interest rate swaps assets	426	350
Financial liabilities:
Interest rate swaps liabilities	340	430
Interest rate swaps with financial institutions | Carrying Amount
Financial assets:
Interest rate swaps assets	426	350
Financial liabilities:
Interest rate swaps liabilities	340	430
Level 1 Inputs
Financial assets:
Cash and due from banks	59,255	53,000
Interest bearing deposits in banks	266,944	329,103
Other securities	1,087	1,064
Total financial assets	327,286	383,167
Financial liabilities:
Noninterest-bearing deposits	1,109,789	1,025,425
Total financial liabilities	1,109,789	1,025,425
Level 2 Inputs
Financial assets:
Time deposits in other banks	600	600
Securities available for sale	222,088	204,880
Securities held to maturity	35	37
Bank-owned life insurance	68,010	51,430
Servicing asset	209	186
Accrued interest receivable	7,429	6,674
Total financial assets	299,137	264,587
Financial liabilities:
Interest-bearing deposits	1,437,013	1,451,512
Repurchase agreements	1,525	2,342
Junior subordinated debt	6,726	6,726
Note payable		27,679
Accrued interest payable	374	582
Total financial liabilities	1,446,404	1,489,621
Level 2 Inputs | Interest rate swaps with customers
Financial assets:
Interest rate swaps assets	340	430
Financial liabilities:
Interest rate swaps liabilities	426	350
Level 2 Inputs | Interest rate swaps with financial institutions
Financial assets:
Interest rate swaps assets	426	350
Financial liabilities:
Interest rate swaps liabilities	340	430
Level 3 Inputs
Financial assets:
Other investments	12,226	12,063
Loans, including held for sale, net	2,299,742	2,139,645
Total financial assets	$ 2,311,968	$ 2,151,708