Loans - Impaired Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Loans with no related allowance recorded:
Recorded Investment	$ 867	$ 255
Unpaid Principal Balance	1,045	255
Average Recorded Investment	451	757
Interest Income Recognized	22	4
Cash Basis Interest Recognized	11	4
Loans with an allowance recorded:
Recorded Investment	3,111	5,838
Unpaid Principal Balance	3,129	7,268
Related Allowance	1,508	1,594
Average Recorded Investment	4,690	6,239
Interest Income Recognized	62	49
Cash Basis Interest Recognized	55	43
Recorded Investment, Total	3,978	6,093
Unpaid Principal Balance, Total	4,174	7,523
Average Recorded Investment, Total	5,141	6,996
Interest Income Recognized, Total	84	53
Cash Basis Interest Recognized, Total	66	47
Commercial | Closed-end
Loans with no related allowance recorded:
Recorded Investment	0	2
Unpaid Principal Balance	0	2
Average Recorded Investment	0	15
Interest Income Recognized	0	1
Cash Basis Interest Recognized	0	1
Loans with an allowance recorded:
Recorded Investment	164	127
Unpaid Principal Balance	164	127
Related Allowance	102	80
Average Recorded Investment	165	199
Interest Income Recognized	2	2
Cash Basis Interest Recognized	2	2
Commercial | Line of credit
Loans with no related allowance recorded:
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Loans with an allowance recorded:
Recorded Investment	547	0
Unpaid Principal Balance	547	0
Related Allowance	451	0
Average Recorded Investment	286	0
Interest Income Recognized	20	0
Cash Basis Interest Recognized	19	0
Agriculture & AG RE
Loans with no related allowance recorded:
Recorded Investment	341	0
Unpaid Principal Balance	341	0
Average Recorded Investment	85	0
Interest Income Recognized	18	0
Cash Basis Interest Recognized	5	0
Loans with an allowance recorded:
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	80	0
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Construction, Land & Development
Loans with no related allowance recorded:
Recorded Investment	79	0
Unpaid Principal Balance	257	0
Average Recorded Investment	20	299
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Loans with an allowance recorded:
Recorded Investment	62	127
Unpaid Principal Balance	62	419
Related Allowance	57	10
Average Recorded Investment	115	120
Interest Income Recognized	3	0
Cash Basis Interest Recognized	1	0
Commercial RE | Owner occupied
Loans with no related allowance recorded:
Recorded Investment	3	6
Unpaid Principal Balance	3	6
Average Recorded Investment	9	78
Interest Income Recognized	0	0
Cash Basis Interest Recognized	2	0
Loans with an allowance recorded:
Recorded Investment	252	406
Unpaid Principal Balance	252	541
Related Allowance	113	100
Average Recorded Investment	415	586
Interest Income Recognized	10	11
Cash Basis Interest Recognized	7	9
Commercial RE | Non-owner occupied
Loans with no related allowance recorded:
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Loans with an allowance recorded:
Recorded Investment	431	4,076
Unpaid Principal Balance	431	4,955
Related Allowance	201	1,078
Average Recorded Investment	2,129	4,101
Interest Income Recognized	0	17
Cash Basis Interest Recognized	0	17
1-4 Family Residential | Senior Lien
Loans with no related allowance recorded:
Recorded Investment	252	176
Unpaid Principal Balance	252	176
Average Recorded Investment	218	277
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Loans with an allowance recorded:
Recorded Investment	1,082	859
Unpaid Principal Balance	1,100	984
Related Allowance	284	215
Average Recorded Investment	1,079	1,003
Interest Income Recognized	15	14
Cash Basis Interest Recognized	14	10
1-4 Family Residential | Jr. Lien & Lines of Credit
Loans with no related allowance recorded:
Recorded Investment	192	71
Unpaid Principal Balance	192	71
Average Recorded Investment	119	88
Interest Income Recognized	4	3
Cash Basis Interest Recognized	4	3
Loans with an allowance recorded:
Recorded Investment	571	242
Unpaid Principal Balance	571	242
Related Allowance	298	110
Average Recorded Investment	419	230
Interest Income Recognized	12	5
Cash Basis Interest Recognized	12	5
Consumer
Loans with no related allowance recorded:
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Loans with an allowance recorded:
Recorded Investment	2	1
Unpaid Principal Balance	2	0
Related Allowance	2	1
Average Recorded Investment	2	0
Interest Income Recognized	0	0
Cash Basis Interest Recognized	$ 0	$ 0