LOANS - Composition of loans receivable and allowance for loan losses (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Business Activities Loans - Collectively evaluated Loans
Residential 1-4 family	$ 291,788	$ 289,900
Residential 5+ multifamily	8,171	6,153
Construction of residential 1-4 family	10,990	10,951
Home equity lines credit	34,833	34,854
Residential real estate	345,782	341,858
Commercial	172,875	151,940
Construction of commercial	4,239	3,366
Commercial real estate	177,114	155,306
Farm land	3,605	2,912
Vacant land	6,360	6,390
Real estate secured	532,861	506,466
Commercial and industrial	107,410	121,060
Municipal	8,737	8,626
Consumer	5,076	5,309
Unallocated allowance
Totals	654,084	641,461
Business Activities Loans - Collectively evaluated Allowance
Residential 1-4 family	1,857	1,797
Residential 5+ multifamily	78	56
Construction of residential 1-4 family	77	91
Home equity lines credit	329	326
Residential real estate	2,341	2,270
Commercial	1,692	1,587
Construction of commercial	31	36
Commercial real estate	1,723	1,623
Farm land	39	28
Vacant land	146	166
Real estate secured	4,249	4,087
Commercial and industrial	866	1,043
Municipal	55	53
Consumer	92	75
Unallocated allowance	530	337
Totals	5,792	5,595
Business Activities Loans - Individually evaluated Loans
Residential 1-4 family	5,323	5,130
Residential 5+ multifamily	1,767	1,823
Construction of residential 1-4 family
Home equity lines credit	200	633
Residential real estate	7,290	7,586
Commercial	3,443	3,688
Construction of commercial	113	115
Commercial real estate	3,556	3,803
Farm land	994	1,002
Vacant land	207	210
Real estate secured	12,047	12,601
Commercial and industrial	81	84
Municipal
Consumer	4	3
Unallocated allowance
Totals	12,132	12,688
Business Activities Loans - Individually evaluated Allowance
Residential 1-4 family	134	129
Residential 5+ multifamily	6	6
Construction of residential 1-4 family
Home equity lines credit	1	22
Residential real estate	141	157
Commercial	29	60
Construction of commercial
Commercial real estate	29	60
Farm land
Vacant land	4	4
Real estate secured	174	221
Commercial and industrial
Municipal
Consumer
Unallocated allowance
Totals	174	221
Business Activities Loans - Total portfolio Loans
Residential 1-4 family	297,111	295,030
Residential 5+ multifamily	9,938	7,976
Construction of residential 1-4 family	10,990	10,951
Home equity lines credit	35,033	35,487
Residential real estate	353,072	349,444
Commercial	176,318	155,628
Construction of commercial	4,352	3,481
Commercial real estate	180,670	159,109
Farm land	4,599	3,914
Vacant land	6,567	6,600
Real estate secured	544,908	519,067
Commercial and industrial	107,491	121,144
Municipal	8,737	8,626
Consumer	5,080	5,312
Unallocated allowance
Totals	666,216	654,149
Business Activities Loans - Total portfolio Allowance
Residential 1-4 family	1,991	1,926
Residential 5+ multifamily	84	62
Construction of residential 1-4 family	77	91
Home equity lines credit	330	348
Residential real estate	2,482	2,427
Commercial	1,721	1,647
Construction of commercial	31	36
Commercial real estate	1,752	1,683
Farm land	39	28
Vacant land	150	170
Real estate secured	4,423	4,308
Commercial and industrial	866	1,043
Municipal	55	53
Consumer	92	75
Unallocated allowance	530	337
Totals	5,966	5,816
Acquired Loans - Collectively evaluated Loans
Residential 1-4 family	6,016	6,098
Residential 5+ multifamily	5,526	5,649
Construction of residential 1-4 family
Home equity lines credit
Residential real estate	11,542	11,747
Commercial	66,112	72,569
Construction of commercial	1,599	1,659
Commercial real estate	67,711	74,228
Farm land
Vacant land
Real estate secured	79,253	85,975
Commercial and industrial	17,736	20,020
Municipal
Consumer	48	52
Unallocated allowance
Totals	97,037	106,047
Acquired Loans - Collectively evaluated Allowance
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines credit
Residential real estate
Commercial	23	22
Construction of commercial	2	3
Commercial real estate	25	25
Farm land
Vacant land
Real estate secured	25	25
Commercial and industrial	14	16
Municipal
Consumer
Unallocated allowance
Totals	39	41
Acquired Loans - Individually evaluated Loans
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines credit
Residential real estate
Commercial	2,340	3,388
Construction of commercial	258	258
Commercial real estate	2,598	3,646
Farm land
Vacant land
Real estate secured	2,598	3,646
Commercial and industrial
Municipal
Consumer
Unallocated allowance
Totals	2,598	3,646
Acquired Loans - Individually evaluated Allowance
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines credit
Residential real estate
Commercial	193	191
Construction of commercial
Commercial real estate	193	191
Farm land
Vacant land
Real estate secured	193	191
Commercial and industrial
Municipal
Consumer
Unallocated allowance
Totals	193	191
Acquired Loans - ASC 310-30 Loans
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines credit
Residential real estate
Commercial	3,856	3,897
Construction of commercial
Commercial real estate	3,856	3,897
Farm land
Vacant land
Real estate secured	3,856	3,897
Commercial and industrial	133	309
Municipal
Consumer	15	16
Unallocated allowance
Totals	4,004	4,222
Acquired Loans - ASC 310-30 loans Allowance
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines credit
Residential real estate
Commercial	53	59
Construction of commercial
Commercial real estate	53	59
Farm land
Vacant land
Real estate secured	53	59
Commercial and industrial	34	20
Municipal
Consumer
Unallocated allowance
Totals	87	79
Acquired Loans - Total portfolio Loans
Residential 1-4 family	6,016	6,098
Residential 5+ multifamily	5,526	5,649
Construction of residential 1-4 family
Home equity lines credit
Residential real estate	11,542	11,747
Commercial	72,308	79,854
Construction of commercial	1,857	1,917
Commercial real estate	74,165	81,771
Farm land
Vacant land
Real estate secured	85,707	93,518
Commercial and industrial	17,869	20,329
Municipal
Consumer	63	68
Unallocated allowance
Totals	103,639	113,915
Acquired Loans - Total portfolio Allowance
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines credit
Residential real estate
Commercial	269	272
Construction of commercial	2	3
Commercial real estate	271	275
Farm land
Vacant land
Real estate secured	271	275
Commercial and industrial	48	36
Municipal
Consumer
Unallocated allowance
Totals	$ 319	$ 311