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Loans and ALLL (Summary of recorded investment in loans by segments) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	$ 1,333		$ 1,938
Collectively evaluated for impairment, ALLL	6,836		6,437
Total, ALLL	8,169	$ 8,037	8,375	$ 8,100	$ 8,200	$ 7,700
Individually evaluated for impairment, Loans	28,345		31,099
Collectively evaluated for impairment, Loans	1,163,459		1,097,608
Total	1,191,804		1,128,707
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	34		443
Collectively evaluated for impairment, ALLL	2,026		2,120
Total, ALLL	2,060	2,080	2,563	2,021	2,197	1,706
Individually evaluated for impairment, Loans	8,626		9,899
Collectively evaluated for impairment, Loans	700,109		649,630
Total	708,735		659,529
Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	132		132
Collectively evaluated for impairment, ALLL	423		643
Total, ALLL	555	612	775	782	982	611
Individually evaluated for impairment, Loans	13,766		14,298
Collectively evaluated for impairment, Loans	104,694		112,863
Total	118,460		127,161
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	1,167		1,363
Collectively evaluated for impairment, ALLL	702		629
Total, ALLL	1,869	1,882	1,992	2,382	2,167	2,563
Individually evaluated for impairment, Loans	5,953		6,893
Collectively evaluated for impairment, Loans	286,358		268,450
Total	292,311		275,343
Total Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	0		0
Collectively evaluated for impairment, ALLL	1,020		857
Total, ALLL	1,020	927	857	902	882	900
Individually evaluated for impairment, Loans	0		9
Collectively evaluated for impairment, Loans	72,298		66,665
Total	72,298		66,674
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	0		0
Collectively evaluated for impairment, ALLL	2,665		2,188
Total, ALLL	$ 2,665	$ 2,536	$ 2,188	$ 2,013	$ 1,972	$ 1,920

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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