LOANS - ACTIVITY IN ALLOWANCE (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Activity in allowance for loan losses
Beginning Balance	$ 7,541,000	$ 6,521,000	$ 6,012,000
Charge-offs	(1,402,000)	(1,530,000)	(1,950,000)
Recoveries	1,081,000	1,400,000	1,009,000
Provision	500,000	1,150,000	1,450,000
Ending Balance	7,720,000	7,541,000	6,521,000
Carrying amount	1,600,000	1,900,000
Allowance for loan losses	0	0
Contractual fair value of purchased credit impaired loans	2,000,000
Accretable yield, or income expected to be collected
Balance, beginning of period	240,000	408,000
Accretion of income	186,000	168,000
Balance, end of period	54,000	240,000	408,000
Commercial
Activity in allowance for loan losses
Beginning Balance	789,000	486,000	339,000
Charge-offs	(35,000)	(5,000)	(30,000)
Recoveries	19,000	39,000
Provision	202,000	269,000	177,000
Ending Balance	975,000	789,000	486,000
Real estate construction
Activity in allowance for loan losses
Beginning Balance	564,000	411,000	446,000
Recoveries	1,000	15,000	11,000
Provision	(103,000)	138,000	(46,000)
Ending Balance	462,000	564,000	411,000
1-4 family residential
Activity in allowance for loan losses
Beginning Balance	2,301,000	2,081,000	1,829,000
Charge-offs	(249,000)	(126,000)	(284,000)
Recoveries	20,000	19,000	33,000
Provision	244,000	327,000	503,000
Ending Balance	2,316,000	2,301,000	2,081,000
Multi-family residential
Activity in allowance for loan losses
Beginning Balance	581,000	458,000	495,000
Charge-offs			(94,000)
Recoveries	181,000	12,000	30,000
Provision	(122,000)	111,000	27,000
Ending Balance	640,000	581,000	458,000
Non-farm & non-residential
Activity in allowance for loan losses
Beginning Balance	1,203,000	1,213,000	813,000
Charge-offs	(42,000)
Recoveries		454,000	86,000
Provision	393,000	(464,000)	314,000
Ending Balance	1,554,000	1,203,000	1,213,000
Agricultural
Activity in allowance for loan losses
Beginning Balance	856,000	678,000	998,000
Charge-offs		(193,000)	(242,000)
Recoveries	57,000	50,000	23,000
Provision	(419,000)	321,000	(101,000)
Ending Balance	494,000	856,000	678,000
Consumer
Activity in allowance for loan losses
Beginning Balance	547,000	525,000	520,000
Charge-offs	(205,000)	(298,000)	(283,000)
Recoveries	59,000	80,000	66,000
Provision	181,000	240,000	222,000
Ending Balance	582,000	547,000	525,000
Other
Activity in allowance for loan losses
Beginning Balance	60,000	60,000	32,000
Charge-offs	(871,000)	(908,000)	(1,017,000)
Recoveries	744,000	731,000	760,000
Provision	85,000	177,000	285,000
Ending Balance	18,000	60,000	60,000
Unallocated
Activity in allowance for loan losses
Beginning Balance	640,000	609,000	540,000
Provision	39,000	31,000	69,000
Ending Balance	679,000	$ 640,000	$ 609,000
Madison Financial Corp
Activity in allowance for loan losses
Allowance for loan losses	$ 0