Loans and Allowance for Losses - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 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	9,184	$ 8,866
Provision for/(release of) losses	(264)	(431)
(Release of)/provision for losses	(393)	(410)
Charge-offs	0	0
Ending Balance - Allowance for Loan Losses	6,753
Ending Balance - Reserve for Losses	2,038
Ending Balance - Total Allowance for Losses	8,791	8,456
Crops [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	4,394	4,081
(Release of)/provision for losses	(161)	(288)
Charge-offs	0	0
Ending Balance - Total Allowance for Losses	4,233	3,793
Permanent Plantings [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	2,126	2,469
(Release of)/provision for losses	(192)	10
Charge-offs	0	0
Ending Balance - Total Allowance for Losses	1,934	2,479
Livestock [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	1,460	1,211
(Release of)/provision for losses	(8)	25
Charge-offs	0	0
Ending Balance - Total Allowance for Losses	1,452	1,236
Part-Time Farm [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	474	481
(Release of)/provision for losses	(61)	(68)
Charge-offs	0	0
Ending Balance - Total Allowance for Losses	413	413
Agriculture Storage and Processing [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	720	606
(Release of)/provision for losses	17	(84)
Charge-offs	0	0
Ending Balance - Total Allowance for Losses	737	522
Other Commodity [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	10	18
(Release of)/provision for losses	12	(5)
Charge-offs	0	0
Ending Balance - Total Allowance for Losses	22	13
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Allowance for Loan Losses	7,017	6,796
Provision for/(release of) losses	(264)	(431)
Charge-offs	0	0
Ending Balance - Allowance for Loan Losses	6,753	6,365
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Reserve for Losses	2,167	2,070
Provision for/(release of) losses	(129)	21
Charge-offs	0	0
Ending Balance - Reserve for Losses	$ 2,038	$ 2,091