FAIR VALUE DISCLOSURES - Fair market values of all financial instruments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Financial Assets:
Interest bearing deposits in banks	$ 294,461	$ 329,103
Time deposits in other banks	600	600
Securities available for sale	217,627	205,944
Other securities	217,660	205,978
Securities held to maturity	33	34
Other investments	12,091	12,063
Loans, including held for sale, net	466	613
Financial Liabilities:
Noninterest-bearing deposits	1,051,755	1,025,425
Interest-bearing deposits	1,502,872	1,515,335
Repurchase agreements	2,239	2,343
Junior subordinated debt	$ 6,726	$ 6,726
Minimum
Financial Liabilities:
Discount rates	2.30%	2.30%
Maximum
Financial Liabilities:
Discount rates	16.50%	16.50%
Total Fair Value
Financial Assets:
Cash and due from banks	$ 54,117	$ 53,000
Interest bearing deposits in banks	294,461	329,103
Time deposits in other banks	600	600
Securities available for sale	216,539	204,880
Other securities	1,088	1,064
Securities held to maturity	36	37
Other investments	12,091	12,063
Loans, including held for sale, net	2,182,789	2,139,645
Cash surrender value of life insurance	67,550	51,430
Servicing asset	218	186
Accrued interest receivable	6,024	6,674
Total financial assets	2,836,448	2,799,462
Financial Liabilities:
Noninterest-bearing deposits	1,051,755	1,025,425
Interest-bearing deposits	1,454,491	1,451,512
Repurchase agreements	2,239	2,342
Junior subordinated debt	6,726	6,726
Note payable	24,357	27,679
Accrued interest payable	537	582
Total financial liabilities	2,541,040	2,515,046
Carrying Amount
Financial Assets:
Cash and due from banks	54,117	53,000
Interest bearing deposits in banks	294,461	329,103
Time deposits in other banks	600	600
Securities available for sale	216,539	204,880
Other securities	1,088	1,064
Securities held to maturity	33	34
Other investments	12,091	12,063
Loans, including held for sale, net	2,176,187	2,130,492
Cash surrender value of life insurance	67,550	51,430
Servicing asset	218	186
Accrued interest receivable	6,024	6,674
Total financial assets	2,829,843	2,790,306
Financial Liabilities:
Noninterest-bearing deposits	1,051,755	1,025,425
Interest-bearing deposits	1,502,872	1,515,335
Repurchase agreements	2,239	2,343
Junior subordinated debt	6,726	6,726
Note payable	24,357	27,679
Accrued interest payable	537	582
Total financial liabilities	2,589,421	2,578,870
Interest rate swaps with customers | Total Fair Value
Financial Assets:
Interest rate swaps assets	634	430
Financial Liabilities:
Interest rate swaps liabilities	301	350
Interest rate swaps with customers | Carrying Amount
Financial Assets:
Interest rate swaps assets	634	430
Financial Liabilities:
Interest rate swaps liabilities	301	350
Interest rate swaps with financial institutions | Total Fair Value
Financial Assets:
Interest rate swaps assets	301	350
Financial Liabilities:
Interest rate swaps liabilities	634	430
Interest rate swaps with financial institutions | Carrying Amount
Financial Assets:
Interest rate swaps assets	301	350
Financial Liabilities:
Interest rate swaps liabilities	634	430
Level 1 Inputs
Financial Assets:
Cash and due from banks	54,117	53,000
Interest bearing deposits in banks	294,461	329,103
Other securities	1,088	1,064
Total financial assets	349,666	383,167
Financial Liabilities:
Noninterest-bearing deposits	1,051,755	1,025,425
Total financial liabilities	1,051,755	1,025,425
Level 2 Inputs
Financial Assets:
Time deposits in other banks	600	600
Securities available for sale	216,539	204,880
Securities held to maturity	36	37
Cash surrender value of life insurance	67,550	51,430
Servicing asset	218	186
Accrued interest receivable	6,024	6,674
Total financial assets	291,902	264,587
Financial Liabilities:
Interest-bearing deposits	1,454,491	1,451,512
Repurchase agreements	2,239	2,342
Junior subordinated debt	6,726	6,726
Note payable	24,357	27,679
Accrued interest payable	537	582
Total financial liabilities	1,489,285	1,489,621
Level 2 Inputs | Interest rate swaps with customers
Financial Assets:
Interest rate swaps assets	634	430
Financial Liabilities:
Interest rate swaps liabilities	301	350
Level 2 Inputs | Interest rate swaps with financial institutions
Financial Assets:
Interest rate swaps assets	301	350
Financial Liabilities:
Interest rate swaps liabilities	634	430
Level 3 Inputs
Financial Assets:
Other investments	12,091	12,063
Loans, including held for sale, net	2,182,789	2,139,645
Total financial assets	$ 2,194,880	$ 2,151,708