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Loans, Trouble Debt Restructuring (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) Contract	Jun. 30, 2017 USD ($) Contract	Jun. 30, 2018 USD ($) Contract	Jun. 30, 2017 USD ($) Contract	Dec. 31, 2017 USD ($)
Loans [Abstract]
Reserves of allowance for loan losses	$ 87		$ 87		$ 41
Financing receivable modifications [Abstract]
Number of contract, subsequently defaults | Contract	0	0	0	0
Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts | Contract	0	0	0	0
Pre-modification outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Post-modification outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts | Contract	7	5	8	7
Pre-modification outstanding recorded investment	$ 2,277	$ 6,093	$ 2,284	$ 6,797
Post-modification outstanding recorded investment	$ 2,277	$ 6,093	$ 2,284	$ 6,797
Real Estate Loans [Member] | Home Equity [Member] | Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts | Contract	0		0
Pre-modification outstanding recorded investment	$ 0		$ 0
Post-modification outstanding recorded investment	$ 0		$ 0
Real Estate Loans [Member] | Home Equity [Member] | Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts | Contract	1		1
Pre-modification outstanding recorded investment	$ 1		$ 1
Post-modification outstanding recorded investment	$ 1		$ 1
Real Estate Loans [Member] | Mortgages [Member] | Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts | Contract			0
Pre-modification outstanding recorded investment			$ 0
Post-modification outstanding recorded investment			$ 0
Real Estate Loans [Member] | Mortgages [Member] | Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts | Contract			1
Pre-modification outstanding recorded investment			$ 7
Post-modification outstanding recorded investment			$ 7
Real Estate Loans [Member] | Commercial [Member] | Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts | Contract	0	0	0	0
Pre-modification outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Post-modification outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Real Estate Loans [Member] | Commercial [Member] | Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts | Contract	1	5	1	7
Pre-modification outstanding recorded investment	$ 577	$ 6,093	$ 577	$ 6,797
Post-modification outstanding recorded investment	$ 577	$ 6,093	$ 577	$ 6,797
Real Estate Loans [Member] | Agricultural [Member] | Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts | Contract	0		0
Pre-modification outstanding recorded investment	$ 0		$ 0
Post-modification outstanding recorded investment	$ 0		$ 0
Real Estate Loans [Member] | Agricultural [Member] | Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts | Contract	1		1
Pre-modification outstanding recorded investment	$ 1,523		$ 1,523
Post-modification outstanding recorded investment	$ 1,523		$ 1,523
Other Agricultural Loans [Member] | Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts | Contract	0		0
Pre-modification outstanding recorded investment	$ 0		$ 0
Post-modification outstanding recorded investment	$ 0		$ 0
Other Agricultural Loans [Member] | Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts | Contract	4		4
Pre-modification outstanding recorded investment	$ 176		$ 176
Post-modification outstanding recorded investment	$ 176		$ 176

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