LOANS - Composition of loans receivable and allowance for loan losses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Business Activities Loans - Collectively evaluated Loans
Residential 1-4 family	$ 289,900	$ 253,156
Residential 5+ multifamily	6,153	4,640
Construction of residential 1-4 family	10,951	7,998
Home equity lines of credit	34,854	34,298
Residential real estate	341,858	300,092
Commercial	151,940	125,173
Construction of commercial	3,366	6,403
Commercial real estate	155,306	131,576
Farm land	2,912	2,162
Vacant land	6,390	5,486
Real estate secured	506,466	439,316
Commercial and industrial	121,060	74,131
Municipal	8,626	9,566
Consumer	5,309	6,115
Unallocated allowance
Totals	641,461	529,128
Business Activities Loans - Collectively evaluated Allowance
Residential 1-4 family	1,797	1,415
Residential 5+ multifamily	56	33
Construction of residential 1-4 family	91	65
Home equity lines of credit	326	286
Residential real estate	2,270	1,799
Commercial	1,587	1,265
Construction of commercial	36	87
Commercial real estate	1,623	1,352
Farm land	28	23
Vacant land	166	122
Real estate secured	4,087	3,296
Commercial and industrial	1,043	673
Municipal	53	61
Consumer	75	124
Unallocated allowance	337	482
Totals	5,595	4,636
Business Activities Loans - Individually evaluated Loans
Residential 1-4 family	5,130	8,339
Residential 5+ multifamily	1,823	1,771
Construction of residential 1-4 family
Home equity lines of credit	633	719
Residential real estate	7,586	10,829
Commercial	3,688	4,273
Construction of commercial	115	122
Commercial real estate	3,803	4,395
Farm land	1,002	1,031
Vacant land	210	3,077
Real estate secured	12,601	19,332
Commercial and industrial	84	526
Municipal
Consumer	3	80
Unallocated allowance
Totals	12,688	19,938
Business Activities Loans - Individually evaluated Allowance
Residential 1-4 family	129	610
Residential 5+ multifamily	6
Construction of residential 1-4 family
Home equity lines of credit	22	68
Residential real estate	157	678
Commercial	60	113
Construction of commercial		1
Commercial real estate	60	114
Farm land		14
Vacant land	4	29
Real estate secured	221	835
Commercial and industrial		10
Municipal
Consumer
Unallocated allowance
Totals	221	845
Business Activities Loans - Total portfolio Loans
Residential 1-4 family	295,030	261,495
Residential 5+ multifamily	7,976	6,411
Construction of residential 1-4 family	10,951	7,998
Home equity lines of credit	35,487	35,017
Residential real estate	349,444	310,921
Commercial	155,628	129,446
Construction of commercial	3,481	6,525
Commercial real estate	159,109	135,971
Farm land	3,914	3,193
Vacant land	6,600	8,563
Real estate secured	519,067	458,648
Commercial and industrial	121,144	74,657
Municipal	8,626	9,566
Consumer	5,312	6,195
Unallocated allowance
Totals	654,149	549,066
Business Activities Loans - Total portfolio Allowance
Residential 1-4 family	1,926	2,025
Residential 5+ multifamily	62	33
Construction of residential 1-4 family	91	65
Home equity lines of credit	348	354
Residential real estate	2,427	2,477
Commercial	1,647	1,378
Construction of commercial	36	88
Commercial real estate	1,683	1,466
Farm land	28	37
Vacant land	170	151
Real estate secured	4,308	4,131
Commercial and industrial	1,043	683
Municipal	53	61
Consumer	75	124
Unallocated allowance	337	482
Totals	5,816	5,481
Acquired Loans - Collectively evaluated Loans
Residential 1-4 family	6,098	7,023
Residential 5+ multifamily	5,649	6,136
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate	11,747	13,159
Commercial	72,569	81,300
Construction of commercial	1,659	4,612
Commercial real estate	74,228	85,912
Farm land
Vacant land
Real estate secured	85,975	99,071
Commercial and industrial	20,020	45,650
Municipal
Consumer	52	61
Unallocated allowance
Totals	106,047	144,782
Acquired Loans - Collectively evaluated Allowance
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate
Commercial	22	19
Construction of commercial	3	4
Commercial real estate	25	23
Farm land
Vacant land
Real estate secured	25	23
Commercial and industrial	16	24
Municipal
Consumer
Unallocated allowance
Totals	41	47
Acquired Loans - Individually evaluated Loans
Residential 1-4 family		776
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate		776
Commercial	3,388	2,742
Construction of commercial	258	262
Commercial real estate	3,646	3,004
Farm land
Vacant land
Real estate secured	3,646	3,780
Commercial and industrial
Municipal
Consumer
Unallocated allowance
Totals	3,646	3,780
Acquired Loans - Individually evaluated Allowance
Residential 1-4 family		79
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate		79
Commercial	191	107
Construction of commercial
Commercial real estate	191	107
Farm land
Vacant land
Real estate secured	191	186
Commercial and industrial
Municipal
Consumer
Unallocated allowance
Totals	191	186
Acquired Loans - ASC 310-30 Loans
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate
Commercial	3,897	4,787
Construction of commercial
Commercial real estate	3,897	4,787
Farm land
Vacant land
Real estate secured	3,897	4,787
Commercial and industrial	309	1,114
Municipal
Consumer	16	16
Unallocated allowance
Totals	4,222	5,917
Acquired Loans - ASC 310-30 loans Allowance
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate
Commercial	59	2
Construction of commercial
Commercial real estate	59	2
Farm land
Vacant land
Real estate secured	59	2
Commercial and industrial	20
Municipal
Consumer
Unallocated allowance
Totals	79	2
Acquired Loans - Total portfolio Loans
Residential 1-4 family	6,098	7,799
Residential 5+ multifamily	5,649	6,136
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate	11,747	13,935
Commercial	79,854	88,829
Construction of commercial	1,917	4,874
Commercial real estate	81,771	93,703
Farm land
Vacant land
Real estate secured	93,518	107,638
Commercial and industrial	20,329	46,764
Municipal
Consumer	68	77
Unallocated allowance
Totals	113,915	154,479
Acquired Loans - Total portfolio Allowance
Residential 1-4 family		79
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate		79
Commercial	272	128
Construction of commercial	3	4
Commercial real estate	275	132
Farm land
Vacant land
Real estate secured	275	211
Commercial and industrial	36	24
Municipal
Consumer
Unallocated allowance
Totals	$ 311	$ 235