Loans and ALLL (Summary of recorded investment in loans by segments) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	$ 2,602		$ 2,820
Collectively evaluated for impairment, ALLL	4,998		4,580
Total, ALLL	7,600	$ 7,500	7,400	$ 9,000	$ 9,600	$ 10,100
Individually evaluated for impairment, Loans	20,406		22,338
Collectively evaluated for impairment, Loans	899,188		828,154
Total	919,594		850,492
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	811		829
Collectively evaluated for impairment, ALLL	1,308		1,342
Total, ALLL	2,119	2,421	2,171	3,482	3,808	3,821
Individually evaluated for impairment, Loans	6,714		7,969
Collectively evaluated for impairment, Loans	493,660		440,412
Total	500,374		448,381
Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	15		2
Collectively evaluated for impairment, ALLL	519		327
Total, ALLL	534	336	329	363	206	216
Individually evaluated for impairment, Loans	4,229		4,068
Collectively evaluated for impairment, Loans	122,288		111,843
Total	126,517		115,911
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	1,776		1,989
Collectively evaluated for impairment, ALLL	1,354		1,341
Total, ALLL	3,130	3,130	3,330	3,512	3,728	4,235
Individually evaluated for impairment, Loans	9,431		10,266
Collectively evaluated for impairment, Loans	245,685		241,235
Total	255,116		251,501
Total Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	0		0
Collectively evaluated for impairment, ALLL	541		522
Total, ALLL	541	540	522	591	711	645
Individually evaluated for impairment, Loans	32		35
Collectively evaluated for impairment, Loans	37,555		34,664
Total	37,587		34,699
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	0		0
Collectively evaluated for impairment, ALLL	1,276		1,048
Total, ALLL	$ 1,276	$ 1,073	$ 1,048	$ 1,052	$ 1,147	$ 1,183