Loans and Allowance for Losses - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 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	$ 9,144	$ 9,038	9,184	$ 8,866
Provision for/(release of) losses	760	99	1,074	92
Provision for/(release of) losses	623	(3)	650	169
Charge-offs	0	(17)	(67)	(17)
Ending Balance - Allowance for Loan Losses	8,024		8,024
Ending Balance - Reserve for Losses	1,743		1,743
Ending Balance - Total Allowance for Losses	9,767	9,018	9,767	9,018
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Allowance for Loan Losses	7,264	6,789	7,017	6,796
Provision for/(release of) losses	760	99	1,074	92
Charge-offs	0	(17)	(67)	(17)
Ending Balance - Allowance for Loan Losses	8,024	6,871	8,024	6,871
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Reserve for Losses	1,880	2,249	2,167	2,070
Provision for/(release of) losses	(137)	(102)	(424)	77
Charge-offs	0	0	0	0
Ending Balance - Reserve for Losses	1,743	2,147	1,743	2,147
Crops [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	4,773	4,125	4,394	4,081
Provision for/(release of) losses	88	(99)	467	(55)
Charge-offs		0	0	0
Ending Balance - Total Allowance for Losses	4,861	4,026	4,861	4,026
Permanent Plantings [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	1,926	2,368	2,126	2,469
Provision for/(release of) losses	179	40	(21)	(61)
Charge-offs		0	0	0
Ending Balance - Total Allowance for Losses	2,105	2,408	2,105	2,408
Livestock [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	1,423	1,322	1,460	1,211
Provision for/(release of) losses	404	148	367	259
Charge-offs		0	0	0
Ending Balance - Total Allowance for Losses	1,827	1,470	1,827	1,470
Part-Time Farm [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	400	448	474	481
Provision for/(release of) losses	(16)	50	(23)	17
Charge-offs		(17)	(67)	(17)
Ending Balance - Total Allowance for Losses	384	481	384	481
Agriculture Storage and Processing [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	603	720	720	606
Provision for/(release of) losses	(18)	(97)	(135)	17
Charge-offs		0	0	0
Ending Balance - Total Allowance for Losses	585	623	585	623
Other Commodity [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance - Total Allowance for Losses	19	55	10	18
Provision for/(release of) losses	(14)	(45)	(5)	(8)
Charge-offs		0	0	0
Ending Balance - Total Allowance for Losses	$ 5	$ 10	$ 5	$ 10