Loans, Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Recorded Investment
With no related allowance recorded	$ 22,264		$ 21,899
With an allowance recorded	3,834		5,087
Total	26,098		26,986
Unpaid Principal Balance
With no related allowance recorded	25,860		25,851
With an allowance recorded	4,088		5,329
Total	29,948		31,180
Related Allowance
With an allowance recorded	353		363
Average Recorded Investment
With no related allowance recorded	23,345	$ 27,815
With an allowance recorded	3,871	5,452
Total	27,216	33,267
Interest Income Recognized
With no related allowance recorded	522	599
With an allowance recorded	35	43
Total	557	642
Cash basis interest expense on impaired loans	0	11
Commercial and Industrial [Member]
Recorded Investment
With no related allowance recorded	752		1,205
With an allowance recorded	349		356
Total	1,101		1,561
Unpaid Principal Balance
With no related allowance recorded	1,036		1,500
With an allowance recorded	354		356
Total	1,390		1,856
Related Allowance
With an allowance recorded	8		9
Average Recorded Investment
With no related allowance recorded	978	1,232
With an allowance recorded	352	380
Total	1,330	1,612
Interest Income Recognized
With no related allowance recorded	29	35
With an allowance recorded	5	5
Total	34	40
Commercial Secured By Real Estate [Member]
Recorded Investment
With no related allowance recorded	16,811		16,345
With an allowance recorded	2,605		3,883
Total	19,416		20,228
Unpaid Principal Balance
With no related allowance recorded	18,584		18,335
With an allowance recorded	2,731		4,014
Total	21,315		22,349
Related Allowance
With an allowance recorded	239		306
Average Recorded Investment
With no related allowance recorded	17,631	21,608
With an allowance recorded	2,624	3,989
Total	20,255	25,597
Interest Income Recognized
With no related allowance recorded	387	362
With an allowance recorded	19	27
Total	406	389
Residential Real Estate [Member]
Recorded Investment
With no related allowance recorded	3,746		3,734
With an allowance recorded	833		846
Total	4,579		4,580
Unpaid Principal Balance
With no related allowance recorded	4,976		5,055
With an allowance recorded	937		958
Total	5,913		6,013
Related Allowance
With an allowance recorded	93		48
Average Recorded Investment
With no related allowance recorded	3,778	4,326
With an allowance recorded	834	944
Total	4,612	5,270
Interest Income Recognized
With no related allowance recorded	67	82
With an allowance recorded	10	10
Total	77	92
Consumer [Member]
Recorded Investment
With no related allowance recorded	38		81
With an allowance recorded	47		2
Total	85		83
Unpaid Principal Balance
With no related allowance recorded	60		109
With an allowance recorded	66		1
Total	126		110
Related Allowance
With an allowance recorded	13		0
Average Recorded Investment
With no related allowance recorded	41	107
With an allowance recorded	61	18
Total	102	125
Interest Income Recognized
With no related allowance recorded	7	4
With an allowance recorded	1	1
Total	8	5
Agricultural [Member]
Recorded Investment
With no related allowance recorded	413		48
With an allowance recorded	0
Total	413		48
Unpaid Principal Balance
With no related allowance recorded	504		151
With an allowance recorded	0
Total	504		151
Related Allowance
With an allowance recorded	0		0
Average Recorded Investment
With no related allowance recorded	422	20
With an allowance recorded	0	121
Total	422	141
Interest Income Recognized
With no related allowance recorded	12	97
With an allowance recorded	0	0
Total	12	97
Other [Member]
Recorded Investment
With no related allowance recorded	504		486
With an allowance recorded	0
Total	504		486
Unpaid Principal Balance
With no related allowance recorded	700		701
With an allowance recorded	0
Total	700		701
Related Allowance
With an allowance recorded	0		$ 0
Average Recorded Investment
With no related allowance recorded	495	522
With an allowance recorded	0	0
Total	495	522
Interest Income Recognized
With no related allowance recorded	20	19
With an allowance recorded	0	0
Total	$ 20	$ 19