LOANS - Composition of loans receivable by risk rating grade (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Business Activities Loans - Pass
Residential 1-4 family	$ 294,812	$ 285,939
Residential 5+ multifamily	9,917	5,907
Construction of residential 1-4 family	11,582	10,951
Home equity lines of credit	34,463	34,299
Residential real estate	350,774	337,096
Commercial	170,227	145,849
Construction of commercial	8,334	3,366
Commercial real estate	178,561	149,215
Farm land	3,712	2,912
Vacant land	7,349	6,513
Real estate secured	540,396	495,736
Commercial and industrial	112,799	118,804
Municipal	12,499	8,626
Consumer	4,812	5,288
Loans receivable, gross	670,506	628,454
Business Activities Loans - Special mention
Residential 1-4 family	6,657	6,170
Residential 5+ multifamily	1,834	1,906
Construction of residential 1-4 family
Home equity lines of credit	738	512
Residential real estate	9,229	8,588
Commercial	3,611	3,759
Construction of commercial
Commercial real estate	3,611	3,759
Farm land
Vacant land	79	87
Real estate secured	12,919	12,434
Commercial and industrial	1,225	1,734
Municipal
Consumer	39	24
Loans receivable, gross	14,183	14,192
Business Activities Loans - Substandard
Residential 1-4 family	3,242	2,832
Residential 5+ multifamily	153	163
Construction of residential 1-4 family
Home equity lines of credit	328	676
Residential real estate	3,723	3,671
Commercial	6,217	6,020
Construction of commercial	110	115
Commercial real estate	6,327	6,135
Farm land	980	1,002
Vacant land	36
Real estate secured	11,066	10,808
Commercial and industrial	423	606
Municipal
Consumer
Loans receivable, gross	11,489	11,414
Business Activities Loans - Doubtful
Residential 1-4 family		89
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate		89
Commercial
Construction of commercial
Commercial real estate
Farm land
Vacant land
Real estate secured		89
Commercial and industrial
Municipal
Consumer
Loans receivable, gross		89
Business Activities Loans - Loss
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate
Commercial
Construction of commercial
Commercial real estate
Farm land
Vacant land
Real estate secured
Commercial and industrial
Municipal
Consumer
Loans receivable, gross
Business Activities Loans - Total
Residential 1-4 family	304,711	295,030
Residential 5+ multifamily	11,904	7,976
Construction of residential 1-4 family	11,582	10,951
Home equity lines of credit	35,529	35,487
Residential real estate	363,726	349,444
Commercial	180,055	155,628
Construction of commercial	8,444	3,481
Commercial real estate	188,499	159,109
Farm land	4,692	3,914
Vacant land	7,464	6,600
Real estate secured	564,381	519,067
Commercial and industrial	114,447	121,144
Municipal	12,499	8,626
Consumer	4,851	5,312
Loans receivable, gross	696,178	654,149
Acquired Loans - Pass
Residential 1-4 family	5,475	5,989
Residential 5+ multifamily	5,251	5,649
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate	10,726	11,638
Commercial	59,511	70,007
Construction of commercial	551	1,659
Commercial real estate	60,062	71,666
Farm land
Vacant land
Real estate secured	70,788	83,304
Commercial and industrial	13,199	19,110
Municipal
Consumer	47	65
Loans receivable, gross	84,034	102,479
Acquired Loans - Special Mention
Residential 1-4 family	103	109
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate	103	109
Commercial	2,118	4,059
Construction of commercial
Commercial real estate	2,118	4,059
Farm land
Vacant land
Real estate secured	2,221	4,168
Commercial and industrial	844	1,160
Municipal
Consumer	2	3
Loans receivable, gross	3,067	5,331
Acquired Loans - Substandard
Residential 1-4 family	48
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate	48
Commercial	5,677	5,788
Construction of commercial	258	258
Commercial real estate	5,935	6,046
Farm land
Vacant land
Real estate secured	5,983	6,046
Commercial and industrial	83	59
Municipal
Consumer
Loans receivable, gross	6,066	6,105
Acquired Loans - Doubtful
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate
Commercial
Construction of commercial
Commercial real estate
Farm land
Vacant land
Real estate secured
Commercial and industrial
Municipal
Consumer
Loans receivable, gross
Acquired Loans - Loss
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate
Commercial
Construction of commercial
Commercial real estate
Farm land
Vacant land
Real estate secured
Commercial and industrial
Municipal
Consumer
Loans receivable, gross
Acquired Loans - Total
Residential 1-4 family	5,626	6,098
Residential 5+ multifamily	5,251	5,649
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate	10,877	11,747
Commercial	67,306	79,854
Construction of commercial	809	1,917
Commercial real estate	68,115	81,771
Farm land
Vacant land
Real estate secured	78,992	93,518
Commercial and industrial	14,126	20,329
Municipal
Consumer	49	68
Loans receivable, gross	$ 93,167	$ 113,915