Loans and Allowance for Losses - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Allowance for Loan Losses			$ 7,017
Beginning Balance - Reserve for Losses			2,167
Beginning Balance - Total Allowance for Losses	$ 8,791	$ 8,456	9,184	$ 8,866
Provision for/(release of) losses	578	424	314	(7)
Provision for/(release of) losses	420	582	27	172
Charge-offs	(67)	0	(67)	0
Ending Balance - Allowance for Loan Losses	7,264		7,264
Ending Balance - Reserve for Losses	1,880		1,880
Ending Balance - Total Allowance for Losses	9,144	9,038	9,144	9,038
Crops [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	4,233	3,793	4,394	4,081
Provision for/(release of) losses	540	332	379	44
Charge-offs	0		0
Ending Balance - Total Allowance for Losses	4,773	4,125	4,773	4,125
Permanent Plantings [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	1,934	2,479	2,126	2,469
Provision for/(release of) losses	(8)	(111)	(200)	(101)
Charge-offs	0		0
Ending Balance - Total Allowance for Losses	1,926	2,368	1,926	2,368
Livestock [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	1,452	1,236	1,460	1,211
Provision for/(release of) losses	(29)	86	(37)	111
Charge-offs	0		0
Ending Balance - Total Allowance for Losses	1,423	1,322	1,423	1,322
Part-Time Farm [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	413	413	474	481
Provision for/(release of) losses	54	35	(7)	(33)
Charge-offs	(67)		(67)
Ending Balance - Total Allowance for Losses	400	448	400	448
Agriculture Storage and Processing [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	737	522	720	606
Provision for/(release of) losses	(134)	198	(117)	114
Charge-offs	0		0
Ending Balance - Total Allowance for Losses	603	720	603	720
Other Commodity [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	22	13	10	18
Provision for/(release of) losses	(3)	42	9	37
Charge-offs	0		0
Ending Balance - Total Allowance for Losses	19	55	19	55
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Allowance for Loan Losses	6,753	6,365	7,017	6,796
Provision for/(release of) losses	578	424	314	(7)
Charge-offs	(67)	0	(67)	0
Ending Balance - Allowance for Loan Losses	7,264	6,789	7,264	6,789
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Reserve for Losses	2,038	2,091	2,167	2,070
Provision for/(release of) losses	(158)	158	(287)	179
Charge-offs	0	0	0	0
Ending Balance - Reserve for Losses	$ 1,880	$ 2,249	$ 1,880	$ 2,249