Loans and ALLL (Summary of changes in ALLL by segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	$ 10,700	$ 11,700	$ 11,500	$ 11,936
Allowance for loan losses, Loans charged off	(416)	(602)	(1,277)	(1,843)
Allowance for loan losses, Recoveries	278	151	781	641
Allowance for loan losses, Provision for loan losses	(162)	351	(604)	866
Allowance for loan losses, Ending Balance	10,400	11,600	10,400	11,600
Commercial [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	5,012	6,472	6,048	6,862
Allowance for loan losses, Loans charged off	(163)	(394)	(434)	(839)
Allowance for loan losses, Recoveries	171	66	477	289
Allowance for loan losses, Provision for loan losses	(704)	69	(1,775)	(99)
Allowance for loan losses, Ending Balance	4,316	6,213	4,316	6,213
Agricultural [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	219	335	434	407
Allowance for loan losses, Loans charged off	0	(12)	(31)	(12)
Allowance for loan losses, Recoveries	0	0	0	0
Allowance for loan losses, Provision for loan losses	(31)	108	(215)	36
Allowance for loan losses, Ending Balance	188	431	188	431
Residential Real Estate [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	3,981	3,676	3,845	3,627
Allowance for loan losses, Loans charged off	(180)	(94)	(557)	(681)
Allowance for loan losses, Recoveries	68	38	190	152
Allowance for loan losses, Provision for loan losses	92	127	483	649
Allowance for loan losses, Ending Balance	3,961	3,747	3,961	3,747
Consumer [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	802	647	639	666
Allowance for loan losses, Loans charged off	(73)	(102)	(255)	(311)
Allowance for loan losses, Recoveries	39	47	114	200
Allowance for loan losses, Provision for loan losses	(47)	74	223	111
Allowance for loan losses, Ending Balance	721	666	721	666
Unallocated [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	686	570	534	374
Allowance for loan losses, Loans charged off	0	0	0	0
Allowance for loan losses, Recoveries	0	0	0	0
Allowance for loan losses, Provision for loan losses	528	(27)	680	169
Allowance for loan losses, Ending Balance	$ 1,214	$ 543	$ 1,214	$ 543