LOANS AND ALLOWANCE FOR LOAN LOSSES - Risk Categories of Loans by Class of Loans - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Risk category of loans
Loans	$ 2,155,392	$ 1,957,765
Pass
Risk category of loans
Loans	1,181,671	995,989
Special Mention
Risk category of loans
Loans	19,019	34,922
Substandard
Risk category of loans
Loans	7,157	22,927
Substandard Commercial
Risk category of loans
Loans	1,117	1,865
Non-accrual
Risk category of loans
Loans	4,787	3,278
Performing
Risk category of loans
Loans	157,628	143,086
Watch
Risk category of loans
Loans	$ 169	231
Minimum | Substandard
Risk category of loans
Period of loans past due	90 days
Minimum | Non-accrual
Risk category of loans
Period for which principal and interest has been in default	90 days
Minimum | Watch
Risk category of loans
Period of loans past due	60 days
Minimum | Loss
Risk category of loans
Period of loans past due	119 days
Maximum | Watch
Risk category of loans
Period of loans past due	89 days
Consumer loans not secured by 1-4 family residential real estate | Minimum | Substandard
Risk category of loans
Period of loans past due	60 days
Consumer loans not secured by 1-4 family residential real estate | Maximum | Substandard
Risk category of loans
Period of loans past due	119 days
Commercial
Risk category of loans
Loans	$ 445,664	322,430
Commercial | Commercial and industrial
Risk category of loans
Loans	380,960	275,646
Commercial | Commercial and industrial | Pass
Risk category of loans
Loans	338,436	226,731
Commercial | Commercial and industrial | Special Mention
Risk category of loans
Loans	8,324	9,926
Commercial | Commercial and industrial | Substandard
Risk category of loans
Loans	636	1,596
Commercial | Commercial and industrial | Substandard Commercial
Risk category of loans
Loans	99	444
Commercial | Commercial and industrial | Non-accrual
Risk category of loans
Loans	555	35
Commercial | Commercial and industrial | Performing
Risk category of loans
Loans	32,910	36,839
Commercial | Commercial and industrial | Watch
Risk category of loans
Loans		75
Commercial | Agricultural
Risk category of loans
Loans	64,704	46,784
Commercial | Agricultural | Pass
Risk category of loans
Loans	58,253	46,634
Commercial | Agricultural | Substandard Commercial
Risk category of loans
Loans	7
Commercial | Agricultural | Non-accrual
Risk category of loans
Loans		150
Commercial | Agricultural | Performing
Risk category of loans
Loans	6,444
Commercial Real Estate
Risk category of loans
Loans	925,884	879,868
Commercial Real Estate | Farm
Risk category of loans
Loans	97,916	76,849
Commercial Real Estate | Farm | Pass
Risk category of loans
Loans	75,924	75,191
Commercial Real Estate | Farm | Special Mention
Risk category of loans
Loans	328	966
Commercial Real Estate | Farm | Substandard
Risk category of loans
Loans	713
Commercial Real Estate | Farm | Non-accrual
Risk category of loans
Loans	308	692
Commercial Real Estate | Farm | Performing
Risk category of loans
Loans	20,643
Commercial Real Estate | Hotel
Risk category of loans
Loans	72,193	74,962
Commercial Real Estate | Hotel | Pass
Risk category of loans
Loans	72,193	60,704
Commercial Real Estate | Hotel | Special Mention
Risk category of loans
Loans		2,835
Commercial Real Estate | Hotel | Substandard
Risk category of loans
Loans		11,423
Commercial Real Estate | Construction and development
Risk category of loans
Loans	77,394	61,640
Commercial Real Estate | Construction and development | Pass
Risk category of loans
Loans	60,246	60,971
Commercial Real Estate | Construction and development | Special Mention
Risk category of loans
Loans		372
Commercial Real Estate | Construction and development | Substandard
Risk category of loans
Loans	2,499	219
Commercial Real Estate | Construction and development | Substandard Commercial
Risk category of loans
Loans	31
Commercial Real Estate | Construction and development | Non-accrual
Risk category of loans
Loans	113	78
Commercial Real Estate | Construction and development | Performing
Risk category of loans
Loans	14,438
Commercial Real Estate | Construction and development | Watch
Risk category of loans
Loans	67
Commercial Real Estate | Other
Risk category of loans
Loans	678,381	666,417
Commercial Real Estate | Other | Pass
Risk category of loans
Loans	576,619	525,758
Commercial Real Estate | Other | Special Mention
Risk category of loans
Loans	10,367	20,823
Commercial Real Estate | Other | Substandard
Risk category of loans
Loans	3,309	9,689
Commercial Real Estate | Other | Substandard Commercial
Risk category of loans
Loans	980	1,421
Commercial Real Estate | Other | Non-accrual
Risk category of loans
Loans	3,811	2,323
Commercial Real Estate | Other | Performing
Risk category of loans
Loans	83,193	106,247
Commercial Real Estate | Other | Watch
Risk category of loans
Loans	102	156
Residential
Risk category of loans
Loans	727,073	709,495
Residential | Substandard
Risk category of loans
Loans	3,904	4,707
Residential | Performing
Risk category of loans
Loans	720,819	702,819
Residential | Watch
Risk category of loans
Loans	2,350	1,969
Residential | 1-4 family
Risk category of loans
Loans	438,808	435,336
Residential | 1-4 family | Substandard
Risk category of loans
Loans	2,771	3,186
Residential | 1-4 family | Performing
Risk category of loans
Loans	434,133	430,431
Residential | 1-4 family | Watch
Risk category of loans
Loans	1,904	1,719
Residential | Home equity
Risk category of loans
Loans	288,265	274,159
Residential | Home equity | Substandard
Risk category of loans
Loans	1,133	1,521
Residential | Home equity | Performing
Risk category of loans
Loans	286,686	272,388
Residential | Home equity | Watch
Risk category of loans
Loans	446	250
Consumer
Risk category of loans
Loans	56,771	45,972
Consumer | Substandard
Risk category of loans
Loans	101	149
Consumer | Performing
Risk category of loans
Loans	56,638	45,786
Consumer | Loss
Risk category of loans
Loans	32	37
Consumer | Direct
Risk category of loans
Loans	56,312	45,360
Consumer | Direct | Substandard
Risk category of loans
Loans	101	142
Consumer | Direct | Performing
Risk category of loans
Loans	56,179	45,181
Consumer | Direct | Loss
Risk category of loans
Loans	32	37
Consumer | Indirect
Risk category of loans
Loans	459	612
Consumer | Indirect | Substandard
Risk category of loans
Loans		7
Consumer | Indirect | Performing
Risk category of loans
Loans	$ 459	$ 605