Loans, Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Recorded Investment
With no related allowance recorded	$ 22,347		$ 22,347		$ 21,899
With an allowance recorded	3,738		3,738		5,087
Total	26,085		26,085		26,986
Unpaid Principal Balance
With no related allowance recorded	25,775		25,775		25,851
With an allowance recorded	3,952		3,952		5,329
Total	29,727		29,727		31,180
Related Allowance
With an allowance recorded	301		301		363
Average Recorded Investment
With no related allowance recorded	23,069	$ 25,762	23,218	$ 26,782
With an allowance recorded	3,823	5,037	3,827	4,967
Total	26,892	30,799	27,045	31,749
Interest Income Recognized
With no related allowance recorded	578	998	1,099	1,580
With an allowance recorded	34	45	70	88
Total	612	1,043	1,169	1,668
Cash basis interest expense on impaired loans			46	11
Commercial and industrial [Member]
Recorded Investment
With no related allowance recorded	1,362		1,362		1,205
With an allowance recorded	355		355		356
Total	1,717		1,717		1,561
Unpaid Principal Balance
With no related allowance recorded	1,635		1,635		1,500
With an allowance recorded	354		354		356
Total	1,989		1,989		1,856
Related Allowance
With an allowance recorded	6		6		9
Average Recorded Investment
With no related allowance recorded	964	1,609	964	1,437
With an allowance recorded	358	389	362	393
Total	1,322	1,998	1,326	1,830
Interest Income Recognized
With no related allowance recorded	26	60	55	82
With an allowance recorded	5	6	10	11
Total	31	66	65	93
Commercial, secured by real estate [Member]
Recorded Investment
With no related allowance recorded	16,289		16,289		16,345
With an allowance recorded	2,632		2,632		3,883
Total	18,921		18,921		20,228
Unpaid Principal Balance
With no related allowance recorded	18,063		18,063		18,335
With an allowance recorded	2,709		2,709		4,014
Total	20,772		20,772		22,349
Related Allowance
With an allowance recorded	196		196		306
Average Recorded Investment
With no related allowance recorded	17,292	19,259	17,460	20,317
With an allowance recorded	2,651	3,746	2,671	3,694
Total	19,943	23,005	20,131	24,011
Interest Income Recognized
With no related allowance recorded	278	742	660	1,099
With an allowance recorded	20	29	42	56
Total	298	771	702	1,155
Residential real estate [Member]
Recorded Investment
With no related allowance recorded	3,808		3,808		3,734
With an allowance recorded	717		717		846
Total	4,525		4,525		4,580
Unpaid Principal Balance
With no related allowance recorded	4,980		4,980		5,055
With an allowance recorded	855		855		958
Total	5,835		5,835		6,013
Related Allowance
With an allowance recorded	90		90		48
Average Recorded Investment
With no related allowance recorded	3,855	4,175	3,823	4,305
With an allowance recorded	780	884	760	862
Total	4,635	5,059	4,583	5,167
Interest Income Recognized
With no related allowance recorded	123	138	194	221
With an allowance recorded	8	10	16	20
Total	131	148	210	241
Consumer [Member]
Recorded Investment
With no related allowance recorded	33		33		81
With an allowance recorded	34		34		2
Total	67		67		83
Unpaid Principal Balance
With no related allowance recorded	48		48		109
With an allowance recorded	34		34		1
Total	82		82		110
Related Allowance
With an allowance recorded	9		9		0
Average Recorded Investment
With no related allowance recorded	40	93	54	101
With an allowance recorded	34	18	34	18
Total	74	111	88	119
Interest Income Recognized
With no related allowance recorded	8	3	15	7
With an allowance recorded	1	0	2	1
Total	9	3	17	8
Agricultural [Member]
Recorded Investment
With no related allowance recorded	384		384		48
With an allowance recorded	0		0		0
Total	384		384		48
Unpaid Principal Balance
With no related allowance recorded	384		384		151
With an allowance recorded	0		0		0
Total	384		384		151
Related Allowance
With an allowance recorded	0		0		0
Average Recorded Investment
With no related allowance recorded	423	110	422	107
With an allowance recorded	0	0	0	0
Total	423	110	422	107
Interest Income Recognized
With no related allowance recorded	123	35	135	132
With an allowance recorded	0	0	0	0
Total	123	35	135	132
Other [Member]
Recorded Investment
With no related allowance recorded	471		471		486
With an allowance recorded	0		0		0
Total	471		471		486
Unpaid Principal Balance
With no related allowance recorded	665		665		701
With an allowance recorded	0		0		0
Total	665		665		701
Related Allowance
With an allowance recorded	0		0		$ 0
Average Recorded Investment
With no related allowance recorded	495	516	495	515
With an allowance recorded	0	0	0	0
Total	495	516	495	515
Interest Income Recognized
With no related allowance recorded	20	20	40	39
With an allowance recorded	0	0	0	0
Total	$ 20	$ 20	$ 40	$ 39